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INVITED REVIEW: What is a population? An empirical evaluation of some genetic methods for identifying the number of gene pools and their degree of connectivity

ROBIN S. WAPLES

Northwest Fisheries Science Center, 2725 Montlake Blvd East, Seattle, WA 98112 USA,

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OSCAR GAGGIOTTI

Laboratoire d’Ecologie Alpine (LECA), Génomique des Populations et Biodiversité, Université Joseph Fourier, Grenoble, France

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First published: 13 April 2006
Cited by: 770
Robin Waples, Fax: (206) 860–3335; E‐mail: robin.waples@noaa.gov

Abstract

We review commonly used population definitions under both the ecological paradigm (which emphasizes demographic cohesion) and the evolutionary paradigm (which emphasizes reproductive cohesion) and find that none are truly operational. We suggest several quantitative criteria that might be used to determine when groups of individuals are different enough to be considered ‘populations’. Units for these criteria are migration rate (m) for the ecological paradigm and migrants per generation (Nm) for the evolutionary paradigm. These criteria are then evaluated by applying analytical methods to simulated genetic data for a finite island model. Under the standard parameter set that includes L = 20 High mutation (microsatellite‐like) loci and samples of S = 50 individuals from each of n = 4 subpopulations, power to detect departures from panmixia was very high (∼100%; P < 0.001) even with high gene flow (Nm = 25). A new method, comparing the number of correct population assignments with the random expectation, performed as well as a multilocus contingency test and warrants further consideration. Use of Low mutation (allozyme‐like) markers reduced power more than did halving S or L. Under the standard parameter set, power to detect restricted gene flow below a certain level X (H0: Nm < X) can also be high, provided that true Nm ≤ 0.5X. Developing the appropriate test criterion, however, requires assumptions about several key parameters that are difficult to estimate in most natural populations. Methods that cluster individuals without using a priori sampling information detected the true number of populations only under conditions of moderate or low gene flow (Nm ≤ 5), and power dropped sharply with smaller samples of loci and individuals. A simple algorithm based on a multilocus contingency test of allele frequencies in pairs of samples has high power to detect the true number of populations even with Nm = 25 but requires more rigorous statistical evaluation. The ecological paradigm remains challenging for evaluations using genetic markers, because the transition from demographic dependence to independence occurs in a region of high migration where genetic methods have relatively little power. Some recent theoretical developments and continued advances in computational power provide hope that this situation may change in the future.

Introduction

A centrepiece of the modern evolutionary synthesis has been development of a rich body of population genetic theory. Early work by Wright, Fisher, and others has been expanded and applied to a vast range of species and biological questions. A recurrent theme of this body of work is the study of genetic structure of species in nature and elucidation of patterns of genetic and demographic connectivity among different groups of individuals, or ‘populations’. The concept of a ‘population’ thus is central to the fields of ecology, evolutionary biology, and conservation biology, and numerous definitions can be found in the literature (Table 1).

Table 1. A representative sampling of definitions of ‘population’ and related terms
Population definitions Reference
Ecological paradigm
 A group of organisms of the same species occupying a particular space at a particular time 1, 2
 A group of individuals of the same species that live together in an area of sufficient size that all requirements for reproduction, survival and migration can be met 3
 A group of organisms occupying a specific geographical area or biome 4
 A set of individuals that live in the same habitat patch and therefore interact with each other 5
 A group of individuals sufficiently isolated that immigration does not substantially affect the population dynamics or extinction risk over a 100‐year time frame 6
Evolutionary paradigm
 A community of individuals of a sexually reproducing species within which matings take place 7
 A major part of the environment in which selection takes place 8
 A group of interbreeding individuals that exist together in time and space 9
 A group of conspecific organisms that occupy a more or less well‐defined geographical region and exhibit reproductive continuity from generation to generation 10
 A group of individuals of the same species living close enough together than any member of the group can potentially mate with any other member 11
Statistical paradigm
 An aggregate about which we want to draw inference by sampling 12
 The totality of individual observations about which inferences are to be made, existing within a specified sampling area limited in space and time 13
Variations
 Stock: a species, group, or population of fish that maintains and sustains itself over time in a definable area 14
 Demographic units: those having separate demographic histories 15
 Demes: separate evolutionary units 15
 Interaction group: based on distance an individual might travel during the nondispersive stage of its life 16
 Natural population: can only be bounded by natural ecological or genetic barriers 17
 Local population: (i) individuals have a chance to interact ecologically and reproductively with other members of the group, and (ii) some members are likely to emigrate to or immigrate from other local groups 17

Given the central importance of the population concept, it might be expected that one could take a commonly used population definition and apply it directly to species in the wild to determine how many populations exist and characterize the relationships among them. Furthermore, one might expect that the definition would be objective and quantitative enough that independent researchers could apply it to a common problem and achieve the same results. In fact, however, few of the commonly used definitions of ‘population’ are operational in this sense; instead, they typically rely on qualitative descriptions such as ‘a group of organisms of the same species occupying a particular space at a particular time’ (Krebs 1994; Table 1). It is easy to see that, confronted with a common body of information, different researchers might come to different conclusions about the number of populations and their interrelationships.

Although the difficulties in defining what a population represents have been widely recognized for some time, this problem has, curiously, remained largely unexplored in the literature. Several recent developments indicate that more concerted effort on this issue would be timely. First, availability of numerous, highly polymorphic DNA markers has spurred an explosive interest in genetic studies of natural populations. These studies have considerable power to detect population structure and routinely estimate population parameters without (generally) attempting to define what a population is. Second, new statistical methods, which allow one to identify the number of ‘populations’ in a group of samples and/or assign individuals to population of origin (Paetkau et al. 1995; Rannala & Mountain 1997; Pritchard et al. 2000; Corander et al. 2003), are being widely and energetically applied. In the absence of a common understanding of what a population represents, it can be difficult to evaluate or compare results of such analyses. Third, recent theoretical and empirical studies (Beerli 2004; Slatkin 2005) have re‐emphasized the point that interactions with unsampled (‘ghost’) populations can affect estimates of key parameters (migration rate, population size, genetic diversity) for populations of interest. Evaluating the nature and magnitude of potential biases caused by this phenomenon implies an operational definition of ‘population’. Finally, genetic data are increasingly being used to inform conservation and management (Moritz 1994; Waples 1995; Crandall et al. 2000; Allendorf et al. 2004). For practical as well as biological reasons, ‘populations’ are natural focal units for conservation and management (McElhany et al. 2000; Beissinger & McCullough 2002), and identification of population boundaries can have far‐reaching management (and legal) implications.

To make progress towards resolving these issues, a number of key questions must be addressed. For example, ‘What is a population (conceptually)?’‘Does the variety of population definitions in the literature represent inevitable variations on a common theme, or does it reflect a fundamental divergence of views regarding what a population is?’‘What specific analyses or tests can be applied to determine whether a unit of interest represents a population?’‘How do these analyses/tests perform with real data, and how does performance depend on the choice of population definition and criteria to evaluate them?’. To address these questions, a conceptual framework is needed to frame the problem. Second, it is necessary to define quantitative criteria that can make the conceptual definitions operational. Third, because it is often difficult to evaluate the criteria directly, metrics must be developed that can be measured or computed for species in the wild. These metrics can be used to determine whether population criteria have been met. Finally, analysis of realistic sample data sets is important to make the examples concrete and evaluate performance of various population definitions, criteria, and metrics.

Collectively, this represents an ambitious research programme — much more than can be accomplished in a single paper. Our objectives here are more limited. First, we briefly review published definitions of biological ‘populations’ and identify some common themes. Second, we suggest quantitative criteria and metrics that might be used to make some generic population definitions operational. Finally, we empirically evaluate performance of a number of genetic methods for identifying the number of ‘populations’ and their degree of connectivity. Because the potential parameter space to consider is so large, we have chosen to focus on a relatively simple model of population structure and assess sensitivity of results to factors of specific interest to researchers involved in the study of natural populations: type of genetic markers, numbers of individuals and gene loci sampled, number of populations, and population size.

Conceptual framework

Population definitions

Table 1 is certainly not an exhaustive list of population definitions but it is intended to be representative. As a first cut, we can distinguish statistical vs. biological definitions. The former refer to an aggregate of things (which may or may not represent individuals) about which one wants to draw inferences by sampling. Biological definitions, in contrast, refer exclusively to collections of individuals that share some biological attributes (but see Pielou 1974 for a largely statistical definition of a biological population). This paper will be concerned with biological definitions of ‘population’.1

Although a wide range of biological definitions can be found in the literature, some patterns are apparent. First, all imply a cohesive process that unites individuals within a population. Second, two major types of biological definition can be identified (Andrewartha & Birch 1984; Crawford 1984): those reflecting an ecological paradigm and those reflecting an evolutionary paradigm. Within each paradigm, various flavours of definition can be found, but all share strong commonalities. In the ecological paradigm, the cohesive forces are largely demographic, and emphasis is on co‐occurrence in space and time so that individuals have an opportunity to interact demographically (competition, social and behavioural interactions, etc.). In the evolutionary paradigm, the cohesive forces are primarily genetic, and emphasis is on reproductive interactions between individuals. We will consider these two population paradigms separately, and we adopt a general working definition of ‘population’ for each paradigm as follows:

Ecological paradigm: A group of individuals of the same species that co‐occur in space and time and have an opportunity to interact with each other.

Evolutionary paradigm: A group of individuals of the same species living in close enough proximity that any member of the group can potentially mate with any other member.

A simple metapopulation model

We use a simple model to make this problem concrete and allow quantitative analysis. Consider a metapopulation comprised of n subunits (subpopulations; n ≥ 2) that might or might not represent ‘populations’. Within each subpopulation mating is random, and the subpopulations are linked (perhaps) by migration. Two extreme scenarios can be identified (Fig. 1). In the first (Fig. 1A), the subpopulations are completely isolated (no direct genetic or demographic linkages) and do not really behave as a metapopulation at all, except perhaps on very long timescales. In this scenario therefore the subpopulations would be considered separate populations under both paradigms. At the other extreme (Fig. 1D), mating is random within the entire metapopulation; in this scenario therefore the metapopulation is panmictic and the subpopulations are arbitrary. In a metapopulation with n subpopulations and total size

image

The continuum of population differentiation. Each group of circles represents a group of subpopulations with varying degrees of connectivity (geographical overlap and/or migration). (A) Complete independence. (B) Modest connectivity. (C) Substantial connectivity. (D) Panmixia; ‘subpopulations’ are completely congruent.

image

panmixia occurs when, for each subpopulation, the proportion of migrants is given by mi = (NrNi)/NI— that is, when the probability of not migrating from the natal subpopulation (1 –mi) is just the ratio of the size of the natal subpopulation to the metapopulation size (Ni/NT). If all subpopulations are the same size, then panmixia occurs when all mi = (n– 1)/n.

Most real‐world situations are intermediate to these two extremes (Fig. 1B, C). This raises two fundamental questions with respect to population identification. First, given that the magnitude of departure from panmixia occurs along a continuum (Fig. 1, bottom), how does one define a point along that continuum at which subunits are differentiated enough to be considered ‘populations’? With the exception perhaps of McElhany et al. (2000), none of the definitions in Table 1 is quantitative enough to serve as an unambiguous guide for answering this question. It will therefore be necessary to consider alternative criteria to make the working definitions for the two paradigms operational. Second, assuming one has defined a point along the continuum that corresponds to the concept ‘population’, how can one in practice determine whether units of interest are populations? This is a quantitative question that requires developing population metrics that can be evaluated for power and sensitivity.

Population criteria

Evolutionary paradigm. Reproductive cohesiveness is determined by levels of gene flow. As shown by Wright (1931), the evolutionary consequences of gene flow scale with the absolute number of effective migrants, Nem, so population criteria under the evolutionary paradigm should be couched in terms of Nem. What values of Nem might correspond to separate populations? First, one might consider that separate populations exist when any departure from panmixia is found. Assuming an island model in which all migration rates are the same (all mi = m), panmixia occurs when m = (n – 1)/n, which implies that Nem = Ne(n – 1)/n. That is, in a panmictic metapopulation the number of immigrants per generation into each subpopulation is Ne(n − 1)/n. This suggests one possible population criterion:

Criterion EV1: Nem < Ne(n − 1)/n.

Another possible criterion depends on the relative importance of migration and drift in determining subpopulation allele frequencies. If m << 1/Ne, then the random (dispersive) process of drift dominates and population allele frequencies tend to behave independently. If m >> 1/Ne, the deterministic (cohesive) force of gene flow dominates, limiting the amount of divergence among subpopulations. A transition between these two regimes occurs at approximately m = 1/Ne, or Nem = 1. Therefore, another possible population criterion is:

Criterion EV2: Nem < 1.

N e m = 1 (one migrant per generation) is commonly used as a guideline for management of endangered species (e.g. Mills & Allendorf 1996; Wang 2004). However, EV2 may be too stringent as a population criterion, because substantial departures from random mating (and substantial differences in subpopulation allele frequency) can occur when Nem > 1. Choice of any particular value in the range 1 < Nem < Ne(n– 1)/n is somewhat arbitrary. To capture the range commonly encountered in studies of species in nature, we explore two additional criteria:

Criterion EV3: Nem < 5

Criterion EV4: Nem < 25.

Using the well‐known approximation FST≈ 1/(1 + 4Nem), Nem < 5 implies FST > 0.05. Wright (1978) indicated that genetic differentiation is ‘by no means negligible’ if FST is as small as 0.05. If Nem is as large as 25, FST will be ∼0.01, a small value that nevertheless can be associated with statistically significant evidence for departures from panmixia.

Ecological paradigm. Demographic cohesiveness scales with the fraction of the subpopulation that immigrates from other subpopulations (m). One could test whether m is less than expected under panmixia [the analogue to Criterion EV1 is m < (n– 1)/n), but such a test has limited relevance for most ecological considerations. A more relevant question is, how small must m be before the subpopulations are demographically independent? Although this question would appear to be fundamental to understanding metapopulation processes, it has apparently received little formal study. The limited available information (Hastings 1993) suggests that transition to demographic independence occurs when m falls below about 10%. This suggests a possible criterion:

Criterion EC1: m < 0.1.

As discussed in Methods, we considered several different metrics to test whether these population criteria are met and evaluated their performance using simulated data.

Methods

Simulated data

Genotypic data were generated by easypop (Balloux 2001). We considered a finite island model with n subpopulations, each of constant size N and equal sex ratio. Each generation, random mating was simulated to produce a diploid genotype for L independent gene loci for each individual, which then had probability m of migrating to another subpopulation. Under this Wright–Fisher process, NeN in every subpopulation. In the following therefore we will use the term Nm to represent the effective number of migrants per generation (Nem). Within a parameter set, all loci had the same mutation dynamics, which occurred according to the K‐allele model (KAM; each mutation equally likely to occur at any of K possible sites). Two combinations of mutation rate (µ) and number of possible allelic states were considered, one representative of highly polymorphic markers like microsatellites (Estoup & Angers 1998; µ = 5 × 10−4; 10 allelic states), the other representative of low‐mutation rate markers like allozymes or single‐nucleotide polymorphisms (SNPs) (Zhang & Hewitt 2003; Morin et al. 2004; µ = 5 × 10−7, 4 allelic states). In what follows, we will refer to these two mutation patterns as ‘High’ and ‘Low’, respectively. Simulations were initiated with maximal genetic diversity (genotypes in initial generation randomly drawn from all possible allelic states). Although the magnitude of population differentiation reaches equilibrium rapidly under the conditions considered here (Crow & Aoki 1984), we ran each replicate for 5000 generations before collecting data to attain an approximate mutation–drift equilibrium. In the final generation of each replicate, samples of S individuals were taken from each subpopulation for genetic analysis. Default values for key parameters (the ‘standard model’) were N (500), n (4), S (50), L (20), High mutation, and m was chosen to yield Nm values ranging from 0.1 individual/generation to panmixia. Except as noted, we analysed 100 replicates for each parameter set (Table 2). Each parameter set was given a two‐part name, with the second part indicating the number of migrants per generation (Nm) and the first part indicating changes from the standard parameter set (Hi = standard set with High mutation markers; Lo = standard set with Low mutation markers; 25S = sample size of 25; 10L = 10 loci; 2n, 8n = 2 or 8 subpopulations; 200N, 100N, 50N = subpopulation size different than 500; C = combination low power with Low mutation markers, L = 10, and S = 25.

Table 2. Parameter sets considered in our analyses of the Evolutionary and Ecological paradigms. The following were fixed in all sets: dioecious; random mating; equal sex ratio; finite island model; all subpopulations of constant size Ne = N; K‐allele mutation. Variable input parameters: n, number of subpopulations; m, migration rate; L, number of loci; S, sample size. Diversity data are averages across replicates: LP, mean number of polymorphic loci; Hs, mean subpopulation gene diversity, calculated over polymorphic loci only
Parameter set Input parameters Diversity
n N m Nm Mutation L S L P H s
Evolutionary
 Hi‐P 4 500 0.75 375 High 20 50 20.0 0.73
 Hi‐25 4 500 0.05 25 High 20 50 20.0 0.73
 Hi‐5 4 500 0.01 5 High 20 50 20.0 0.72
 Hi‐1 4 500 0.002 1 High 20 50 20.0 0.67
 Hi‐01 4 500 0.0002 0.1 High 20 50 20.0 0.54
 Lo‐P 4 500 0.75 375 Low 20 50 12.6 0.36
 Lo‐25 4 500 0.05 25 Low 20 50 12.1 0.35
 Lo‐5 4 500 0.01 5 Low 20 50 12.4 0.36
 Lo‐1 4 500 0.002 1 Low 20 50 13.9 0.32
 Lo‐01 4 500 0.0002 0.1 Low 20 50 18.0 0.18
 100N‐25 4 100 0.25 25 High 20 50 19.9 0.44
 100N‐5 4 100 0.05 5 High 20 50 19.8 0.43
 100N‐1 4 100 0.01 1 High 20 50 19.9 0.41
 2n‐25 2 500 0.05 25 High 20 50 20.0 0.62
 2n‐5 2 500 0.01 5 High 20 50 20.0 0.61
 2n‐1 2 500 0.002 1 High 20 50 20.0 0.60
 8n‐25 8 500 0.05 25 High 20 50 20.0 0.81
 8n‐5 8 500 0.01 5 High 20 50 20.0 0.78
 8n‐1 8 500 0.002 1 High 20 50 20.0 0.71
 10L‐25 4 500 0.05 25 High 10 50 10.0 0.73
 10L‐5 4 500 0.01 5 High 10 50 10.0 0.72
 10L‐1 4 500 0.002 1 High 10 50 10.0 0.67
 25S‐25 4 500 0.05 25 High 20 25 20.0 0.73
 25S‐5 4 500 0.01 5 High 20 25 20.0 0.72
 25S‐1 4 500 0.002 1 High 20 25 20.0 0.67
 C‐25 4 500 0.05 25 Low 10 25 6.0 0.36
 C‐5 4 500 0.01 5 Low 10 25 6.2 0.35
 C‐1 4 500 0.002 1 Low 10 25 7.5 0.34
Ecological
 Hi‐100 4 500 0.2 100 High 20 50 20.0 0.74
 Hi‐50 4 500 0.1 50 High 20 50 20.0 0.73
 200N‐20 4 200 0.1 20 High 20 50 20.0 0.58
 200N‐10 4 200 0.05 10 High 20 50 20.0 0.57
 200N‐2 4 200 0.01 2 High 20 50 20.0 0.55
 50N‐5 4 50 0.1 5 High 20 50 18.5 0.30
 50N‐2.5 4 50 0.05 2.5 High 20 50 18.6 0.29
 50N‐0.5 4 50 0.01 0.5 High 20 50 18.9 0.27

Testing panmixia

Contingency tests. Contingency tests of allele frequency heterogeneity followed the method of Raymond & Rousset (1995), which uses Markov chain Monte Carlo (MCMC) methods to provide an unbiased estimate of the exact probability for each single‐locus comparison. Calculations were performed using a version of the program rxc (available at http://www.marksgeneticsoftware.net/Miller program) that was modified to (i) allow batch processing of multiple data sets, and (ii) compute a multilocus P value for each comparison using Fisher's method for combining probabilities across loci. For each randomization test, we ran 10 batches of 10 000 replicates each, with 1000 dememorization steps. To minimize opportunities for a single locus to dominate the overall test (Lugon‐Moulin et al. 1999), we constrained the single locus P values to be no smaller than 0.0001.

Assignment tests. Assignment tests used the Rannala & Mountain (1997) method as implemented in geneclass2 (Piry et al. 2004). An individual was considered correctly assigned if assignment was to the population in which it was sampled. First‐generation migrants might be incorrectly assigned by this criterion. With N = 500 individuals per subpopulation, Nm = 1, 5, and 25 migrants per generation represented 0.2%, 1%, and 5% of each subpopulation, respectively. Therefore, the maximum expected percentage of correct assignments was 99.8%, 99%, and 95%, respectively, for the three levels of migration. The observed percentage of correct assignments was averaged over all subpopulations within a replicate and then across all replicates within a parameter set. For each replicate, the number of correct assignments was compared with that expected under random assignment as follows. If there are n potential sources represented by samples of equal size, the probability of correctly assigning at random any given individual is p = 1/n. If the total number of individuals to be assigned is NA = nS, then the expected number of random, correct assignments is nS/n = S. The probability of a specific number X of correct assignments at random is given by the binomial distribution:

image((eqn 1))

To evaluate whether the observed number of correct assignments was significantly higher than the random expectation, we used the cumulative binomial distribution to identify critical values for the number of correct assignments. Results for parameter sets considered here are shown in Table 3. For example, in the standard parameter set with n = 4, S = 50 (hence NA = 200) 60 or more correct assignments is significant at the P < 0.05 level, 65 is significant at the 0.01 level, and 70 correct assignments are needed to demonstrate performance better than random at P < 0.001.

Table 3. Number of individuals correctly assigned to population of origin required to demonstrate performance greater than random expectation. It is assumed that each of the n samples includes the same number of individuals (S)
n S Number of correct assignments
P < 0.05 P < 0.01 P < 0.001
4 50 60 65 70
4 25 32 35 39
2 50 58 62 65
8 50 61 66 71

F‐statistics. The most commonly used measure of genetic differentiation among populations is Weir & Cockerham's θ (1984), an analogue to FST. To obtain expected values of θ for different combinations of parameters m, u, n, and N = Ne, we used the formula of Cockerham & Weir (1987, 1993), which assumes that u and m are small:

image((eqn 2))

The relationship between θ and GST (the multilocus version of FST) is θ = nGST/(GST+n– 1) (Cockerham & Weir 1987, 1993). If one makes this substitution for θ in equation 2 and assumes that mutation is low enough to be ignored, the result is

image

as obtained by Crow & Aoki (1984). If one further assumes that the number of subpopulations is large enough that the term n/(n– 1) can be ignored, one obtains Wright's familiar formula,

image

We used fstat (version 2.9.3.2; Goudet 1995) to calculate Weir and Cockerham's estimator inline image, confidence intervals (CIs) for inline image by bootstrapping over loci, and average gene diversities (Hs = expected heterozygosity averaged across subpopulations; Nei 1987).

Expected values of θ for three different Nm values (1, 5, and 25, corresponding to critical values for Criteria EV2‐4) were computed for each parameter set using equation 2, and these were used as critical values to test hypotheses about gene flow. For example, assume we want to test the hypothesis that gene flow is less than 25 migrants per generation (Criterion EV4; H0: Nm ≥ 25), given the following parameter values: n = 4; N = 500; µ = 0.0005. With N = 500, Nm = 25 implies m = 0.05, and inserting these values for n, N,µ, and m in equation 2 yields E(θ) = 0.0074. If the lower CI of an observed inline imageis greater than the critical value 0.0074, it can be concluded that gene flow is unlikely to be as high as Nm = 25.

Estimating the number of populations

In these evaluations, the fraction of replicates for which the estimated number of populations () was equal to the true n was used as a performance measure.

Putative populations defined a priori. We compared the performance of two programs that assume each sample is drawn from only one population, but that some populations might have been sampled more than once. In these tests therefore the number of samples represents an upper limit for .

We used rxc as described above to identify replicates in which homogeneity among all the samples could not be rejected at P < 0.01; these replicates were considered to include just one population ( = 1). For replicates showing overall heterogeneity, the number of different populations represented by the n samples was calculated in the following way. First, rxc was used to test whether allele frequencies in each of the J = n (n– 1)/2 pairwise comparisons differed at the P < 0.01 level. Next, a link was drawn between all pairs of samples not differing significantly (see Fig. 2). A group of samples was considered to come from the same population if every pair within the group could be connected through a chain of nonsignificant tests. In the example in Fig. 2 n = 8 samples are determined to represent three populations; population A is comprised of a single sample that differs significantly from all others, whereas populations B and C include 4 and 3 linked samples, respectively.

image

Graphical illustration of an ad hoc method of computing the number of different populations represented by a collection of samples. Each circle represents a sample from a potential ‘population’; dotted lines indicate nonsignificant results for a multilocus contingency test of heterogeneity of allele frequencies among pairs of samples. Samples that can be linked through a chain of nonsignificant tests are considered to be part of the same population. In this example, groups of samples A, B, and C represent three different populations.

Because the pairwise rxc method involves multiple tests within each replicate (the number of pairwise comparisons is J = 1, 6, and 28 for n = 2, 4, and 8, respectively), a certain fraction is expected to be significant just by chance. Quantitative adjustment for multiple testing is problematical because the different pairwise tests are not independent. Nevertheless, some insight into the magnitude of the potential problem can be gained by treating the comparisons as if they were independent. In that case, under panmixia the probability that none of the pairwise tests within a replicate is significant is (1 –α)J; for α = 0.01 this probability is over 94% for n = 4 and over 75% for n = 8. Assuming independence, the chances that all pairwise tests will be significant by chance (αJ) is very remote for n > 2. We therefore expect that under conditions considered here, multiple testing issues will not strongly affect results of the rxc method to estimate the number of populations. In the Results section we present empirical data from the simulations that bear on this issue.

We also evaluated the ‘cluster groups of individuals’ option of baps (version 3.1; Corander et al. 2003; available from http://www.rni.helsinki.fi/~jic/bapspage.html), which uses a Bayesian approach to determine which combination of predetermined samples is best supported by the data. was taken to be the partition with the highest posterior probability. The program uses importance sampling to approximate posterior probabilities for large data sets, but for n = 8 (as considered in this study), baps performs an exact Bayesian analysis by enumerative calculation to arrive at .

Putative populations not defined a priori. The estimation procedure for structure 2.0 (Pritchard et al. 2000) consists in running the program for different trial values of the number of populations, k, and then comparing the estimated log probability of the data under each k, ln[Pr(X | k)]. was taken to be the value with the highest Pr(X | k). A pilot study indicated that runs with a burn‐in of 30 000 and a total length of 100 000 provided consistent estimates of Pr(X | k) when genetic differentiation was strong to moderate (Nm = 1–5). However, we were unable to obtain convergence when genetic divergence was low (Nm = 25), even for runs of up to 4 million iterations. We chose the admixture model and the option for correlated allele frequencies, both appropriate for the migration model we used. For each parameter set we analysed 10 replicate data sets and recorded the proportion of correct assignments and Pr(X | k). Evanno et al. (2005) suggested that an ad hoc measure, Δk, the second order rate of change of ln[Pr(X | k)] with respect to k, provides a more reliable estimator This measure was calculated by carrying out many trial runs of structure (e.g. 20) for each putative k value in each replicate data set and then applying the following equation: Δk =mean [|Pr(X | k+ 1) − 2Pr(X | k) + Pr(X | k− 1)|]/SD[Pr(X | k)], where mean represents the mean and SD represents the standard deviation across trials. Due to computational constraints, we adopted this procedure only for a limited number of scenarios and used only five trial runs of structure for each replicate data set.

Results

Levels of genetic variability

In simulations using High mutation, all or nearly all loci were polymorphic (two or more alleles in at least one sample; Table 2). Occasional exceptions occurred with N ≤ 200 or n = 2, in which case the overall metapopulation size was relatively small and some loci drifted to fixation. Under the ‘standard’ model (n = 4, N = 500, High mutation), average subpopulation gene diversities were Hs ∼ 0.7 (Table 2), comparable to values commonly reported in studies of natural populations using microsatellite markers. Levels of variability were only about half as high in simulations using Low mutation (Hs ∼ 0.35), and only about two‐thirds of the loci were polymorphic (Table 2). Still, the levels of variability were at least as high as those reported in most allozyme studies of natural populations (e.g. Figure 10 in Hartl & Clark 1988).

Type I error rates

Before analysing population subdivision, we evaluated type I error rates under conditions in which the entire metapopulation was panmictic. We used standard parameter sets Hi‐P (High mutation) and Lo‐P (Low mutation) and evaluated 1000 (rather than 100) replicate data sets. The multilocus contingency test produced almost exactly the expected number of significant tests at each significance level (Appendix I): at the P < 0.05 level, 49 tests were significant for High mutation and 50 for Low mutation (50 expected); at the P < 0.01 level, 9 (High) and 10 (Low) were significant (10 expected); at the P < 0.001 level, 1 (High) and 0 (Low) were significant (1 expected). We also found general agreement between the observed and expected distribution of multilocus P values over the full range 0–1 (P > 0.05 for both High and Low mutation markers; Kolmogorov–Smirnov goodness‐of‐fit test). Testing panmixia by comparing observed numbers of correct assignments with the random expectation resulted in slightly elevated type I error rates under both High and Low mutation for each nominal α level considered (Appendix I). However, the mean percentage of correct assignments (24.9% for High mutation; 24.6% for Low mutation) was very close to the random expectation (25% with n = 4).

Bootstrapped CIs for inline image performed somewhat erratically. Under the standard parameter set (High mutation), the lower 95% CI should be larger than zero 2.5% of the time and the lower 99% CI should be larger than zero 0.5% of the time; the observed rates of type I error (9.3% and 2.3%, respectively; Appendix I) were 3–5 times as high as expected. A similar, although slightly less pronounced, upward bias in the type I error rate was found with Low mutation markers. In the case of inline image, it is also possible to test conformance with null hypothesis expectations for nonzero levels of gene flow, based on comparing observed inline image values with those expected using equation 2. This allowed evaluation of the CIs for inline image for a variety of parameter sets with true Nm = 25, 5, or 1. Results (bold cells in Appendix I) varied across parameter sets, with the following general tendencies: the test was slightly conservative (rejecting H0 less often than expected) with Nm = 25 but had approximately the expected type I error rate for Nm = 5 or 1; and type I error rates were slightly elevated for parameter sets using fewer loci and/or smaller samples.

Evolutionary paradigm

Testing departures from panmixia. As shown in Appendix I, all three methods performed well in detecting departures from panmixia, even for ‘hard’ problems with low levels of genetic differentiation. For example, with the standard parameter set and Nm = 25 (Hi‐25), all three methods detected significant population structure 100% of the time using the most stringent criterion (P < 0.001 for contingency tests and assignment tests and P < 0.01 for inline image). As expected, as the problems became even harder (lower mutation rates, fewer loci and populations, smaller sample sizes), performance of all three methods declined somewhat, but performance deteriorated substantially only in the data set (C‐25) that combined all of these factors that reduce power (Appendix I). Over a wide range of ‘hard’ parameter sets, the contingency test and the assignment test methods consistently showed slightly higher power to detect departures from panmixia than did the tests based on CIs for inline image (Fig. 3). Of the former two tests, in some cases the contingency test performed slightly better and in other cases the assignment test method had higher power.

image

Power (percentage of replicates in which panmixia could be rejected at P < 0.01) of three methods when true Nm = 25. Except as noted, parameters were as in standard model (N = 500; n = 4; S = 50; L = 20 High mutation loci). ‘Combo’ = parameter set C‐25 (Low mutation, reduced S and L).

Testing hypotheses about gene flow. In spite of the somewhat erratic type I error rate for the method using CIs for inline image, agreement between inline image and E(θ) was very good for most parameter sets (Appendix I). As expected, given that the approximation in equation 2 assumes migration and mutation rate are small, proportional deviations from E(θ) were slightly larger for large m values.

Results in Appendix I also show that under all parameter sets examined, power to detect restricted gene flow (Criteria EV2–4) can be nearly 100%, provided that actual Nm is much lower than the hypothesized level, Nm(H). For example, under parameter set 10 L‐5 (true Nm = 5 and only 10 loci used), in 100% of the replicates the lower 99% CI for inline image was higher than the expected value of θ for Nm(H) = 25 (E(θ) = 0.0349 from equation 2). Thus, if one has data for 10 microsatellite loci in samples of 50 individuals each drawn from populations among which the actual level of gene flow is 5 migrants per generation, one could be very confident in concluding that gene flow must be less than Nm = 25.

To evaluate in more detail the transition from low to high power to detect restricted gene flow, we conducted additional simulations using the standard model with both High and Low mutation and chose m to produce realized Nm values of 20, 15, and 10. In each case we calculated empirical CIs for inline image and asked whether the lower CI was higher than E(θ) for Nm(H) = 25 (Criterion EV4). Results (Fig. 4) show that with High mutation markers, power to test Criterion EV4 increases rapidly as true Nm drops below 20 migrants per generation and is > 90% if Nm is as low as 10. With Low mutation markers, power remains relatively low unless Nm < 10. Figure 5 shows a more general result for High mutation markers: the transition from low to high power for a wide range of Nm values occurs at approximately true Nm = 0.5*Nm(H); that is, power to detect restricted gene flow is very high if true Nm is no more than half the hypothesized level, but is low otherwise. For the same ratio of true Nm: Nm(H), power is slightly higher when Nm is low. If Low mutation markers are used, power is low unless Nm(H) is about five times the true Nm (Fig. 4; Appendix I; unpublished data).

image

Power to reject hypothesis that Nm < 25 (Criterion EV4) as a function of true Nm and marker type, with other parameters as in the standard model. The hypothesis is rejected if the lower CI for inline image is larger than E(θ) for Nm = 25.

image

Power to reject a hypothesis of restricted gene flow (HO: true Nm < hypothesized Nm at P < 0.05 level) as a function of true and hypothesized Nm. Results (Appendix I and unpublished data) are for the standard model with N = 500, n = 4, S = 50, and L = 20 High mutation markers. Dotted line depicts the relationship true Nm = 0.5 * hypothesized Nm.

As expected, the percentage of correct assignments increases sharply as gene flow becomes more restricted. However, performance of assignment tests also depends heavily on mutation rate and less strongly on S, N, n, and L (Fig. 6; Appendix I).

image

Percentage of correctly assigned individuals using the classical assignment test (Rannala & Mountain 1997) as a function of the number of migrants per generation (P = panmixia). Except as noted, parameters were as in standard model with High mutation markers. With n = 4 subpopulations, the random expectation is 25% correct assignments by chance alone (horizontal dashed line). The diamond symbols connected with a dotted line represent the actual percentage of nonmigrants in each population, which sets an upper limit for expected power.

Estimating the number of populations. The two methods that depend on a priori information about geographical sampling showed dramatically different performance in estimating the true number of gene pools. The pairwise rxc test consistently detected all or nearly all of the populations, except under conditions (C‐5) with the lowest cumulative power (Figs 7 and 8). In contrast, baps almost always underestimated the true number of populations, often dramatically, except in the case of the most extreme population differentiation (Nm = 1).

image

Percentage of replicates in which correct number of populations was detected, using three different methods. rxc and baps evaluated groups of individuals defined by a priori samples; structure performed cluster analysis on individuals. Except as noted, parameters were as in the standard model with Nm = 5.

image

Variation across replicate data sets in number of populations detected, using three different methods. Except as noted, parameters were as in standard model with NM = 5.

In Methods we discussed multiple testing issues associated with the pairwise rxc method and concluded that this issue was not likely to strongly affect results of this study. To evaluate this empirically, we considered results for parameter set Hi‐P (standard model with four samples from a globally panmictic population). Only 9 of 1000 replicates (0.9%) showed significant heterogeneity at the P < 0.01 level (Appendix I), and in each of those replicates multiple pairwise comparisons had P values larger than 0.01, leading to  = 1 according to the criteria outlined in Methods and depicted in Fig. 2. Therefore, only a single population was detected in each of the 1000 replicates, resulting in an empirical type I error rate of 0. These results suggest that, at least for relatively small n, the test is conservative and multiple testing issues are not responsible for the observed power of this approach to detect the true number of populations.

structure proved to be reliable at estimating the true number of populations when gene flow was relatively low (Nm = 5) and full samples of individuals and highly polymorphic loci were used (Figs 7 and 8). Performance was much worse ( = true n in less than 40% of replicates) when sample size or the number of loci used was reduced, and structure did not provide any useful information about the number of populations when gene flow was high (Nm = 25) or Low mutation markers were used (Fig. 7, Appendix II).

We did not find the alternative approach to estimating k proposed by Evanno et al. (2005) to be an improvement over the standard approach (Pritchard et al. 2000) under conditions used here. Both methods performed well when genetic differentiation was strong (Nm = 1) and poorly when differentiation was weak (Nm = 25), but under moderate genetic differentiation (Nm = 5) the standard approach performed better (correct number of populations identified in 90% of replicates vs. 70% for the Δk method; Appendices II and III and unpublished data). Given these results and the computational burden imposed by the Evanno et al. procedure (it requires many trial runs of structure for each k value in each replicate), we used the standard procedure for the remainder of the structure analyses.

The ability of structure to correctly assign individuals to population of origin is lower than that of the classical assignment test, and the proportional difference increases as the problems become harder (higher Nm; fewer loci and individuals; Low mutation: Fig. 9).

image

Comparison of ability of structure and classical assignment tests (Rannala & Mountain 1997) to correctly assign individuals to population of origin. Except as noted, parameters were as in standard model with Nm = 5.

Ecological paradigm

Statistical tests of population differentiation proved to have high power over a wide range of migration rates. Regardless which test was used (contingency test, assignment test, CI for inline image), power to detect highly significant population structure was 100% or nearly so for migration rates that spanned the range m = 0.0002 to 0.1 (Table 2 and Appendix I). Even with m as high as 0.2 (twice as high as Criterion EC1 for demographic independence), under the standard model rxc detected significant differentiation at the P < 0.05 level in over half the replicates, and over a third of the replicates showed differentiation at the P < 0.01 level.

Discussion

Our brief review of literature definitions of ‘population’ makes evident a point that should surprise no one: there is no single ‘correct’ answer to the question, ‘What is a population?’ Instead, the answer depends on the context and underlying objectives. Researchers interested primarily in the interplay of different evolutionary forces (selection, migration, drift) will typically favour a population concept couched in terms of reproductive cohesion, whereas those concerned primarily with conservation or management are more likely to be interested in demographic linkages and the consequences of local depletions. Similarly, regardless which population paradigm is adopted, the question ‘How different must units be before they can be considered separate populations?’ does not have a unique answer; reasonable arguments can be advanced for using any of a variety of points along the continuum of population differentiation as a criterion.

These realities have both desirable and undesirable consequences. The flexible nature of the population concept means that it can be applied to a wide range of scenarios faced by ecologists and evolutionary biologists. On the other hand, this flexibility also can foster ambiguity and confusion among scientists using different population concepts and/or criteria. These difficulties are not unlike those that for many years have surrounded the problem of how to define species (Mayden 1997; Wilson 1999; Wheeler & Meier 2000). The ‘species problem’ involves both conceptual differences and the inherent biological fuzziness of species in nature (Hey et al. 2003), but neither of these factors need represent an insurmountable obstacle to practical application of species concepts.

Although we do not presume to have a solution to the comparable difficulties associated with the ‘population problem’, we believe that meaningful dialogue on these issues is more likely to occur if researchers (i) take time to reflect on how their study fits into a conceptual framework for defining populations; and (ii) clarify in their publications which population paradigm they are following and justify choice of specific quantitative criteria for identifying populations. Toward those ends, we have outlined a basic framework for considering questions about populations, and we have suggested some possible quantitative criteria for each of the population paradigms. If this paper generates more awareness and consideration of these issues, then one of our major objectives will have been accomplished.

A second major objective was to quantitatively evaluate performance of some commonly used methods for detecting population structure, and results of those analyses are discussed below.

Levels of variability

With Low mutation markers, a sharp change in patterns of genetic diversity was seen in the parameter set with the most restricted gene flow (Lo‐01; Nm = 0.1); in this case, nearly all loci were polymorphic (P = 18 compared with P = 12–14 for higher Nm; Table 2) but average subpopulation gene diversity was low (Hs = 0.18 compared with Hs = 0.32–0.36 for higher Nm). This reflects the observation (Wright 1931) that when Nm < 1, alleles tend to drift to fixation in subpopulations, thus lowering Hs. On the other hand, by chance different alleles often become fixed in different subpopulations, thus ‘freezing’ genetic diversity and maintaining a high level of polymorphism across the metapopulation as a whole. A similar reduction in Hs is seen in the parameter set Hi‐01 (Table 2), although with High mutation the effect is more muted because new alleles are constantly being generated within subpopulations. This phenomenon of ‘freezing’ diversity is responsible for the conclusion (Wright 1943) that population subdivision increases overall effective size of the metapopulation. However, this conclusion depends on the assumption that N is constant over time in which case every subpopulation is effectively immortal (Waples 2002). If subpopulation extinction is allowed, results can be very different.

Testing panmixia

Goudet et al. (1996) considered power of single‐locus tests of population genetic differentiation and found that exact contingency tests and methods based on analogues to FST: (i) rejected the null hypothesis of no differentiation close to the expected 5% of the time when the global population was panmictic, and (ii) had comparable power when sample sizes were equal. Results presented here extend these conclusions to the case of multiple loci and different α levels (α = 0.05, 0.01, 0.001). For the multilocus test, we found better agreement with the nominal type I error rate, and slightly higher power, for rxc than inline image (Appendix I; Fig. 3). Although we only evaluated balanced sampling, Goudet et al. (1996) found that power decreases considerably, and more so for FST than the contingency test, if sample sizes differ. Fisher's method for combining probabilities over independent tests (used here in the multilocus rxc tests) can lead to biases in some cases (Goudet 1999; Ryman & Jorde 2001; Whitlock 2005). The ad hoc lower limit of P≥ 0.0001 we placed on single‐locus P values was intended to minimize such problems, and based on the excellent agreement with nominal type I error rates for the rxc tests it appears to have been effective for the experimental conditions used here. Nevertheless, those interested in testing panmixia with multilocus genetic data might want to consider the standard method of summing chi‐square values across loci (Ryman & Jorde 2001), a multilocus generalization of Goudet et al.'s G‐test implemented by Petit et al. (2001), or the weighted Z‐method for combining probabilities described by Whitlock (2005).

It therefore seems that a nonparametric approximation to the exact, multilocus contingency test is the most appropriate method for statistical tests of population differentiation. This test can be very powerful even with weak population differentiation. For example, with samples of L = 20 microsatellite‐like loci and S = 50 individuals/population, power to reject panmixia at the P < 0.001 level was 100% even with high gene flow (Nm = 25) and, consequently, a very small inline image (0.006) (Appendix I). This level of data collection is achievable in many contemporary studies of natural populations. Only for parameter set C‐25, with reduced samples of individuals and loci and Low mutation markers, was power appreciably diminished. In this study, we have assessed power as a function of the number and type of gene loci, which together are proxies for what is probably a more direct determinant of statistical power — the total number of alleles for which data are available (Kalinowski 2002, 2004; Balding 2003).

Somewhat surprisingly, we found that a very different type of test — based on comparing observed and expected numbers of correctly assigned individuals — performed very similarly to the exact rxc test. Although it was recently suggested (Manel et al. 2005) that a test that takes advantage of multilocus genotypic information might be more powerful than standard tests that focus on gene loci individually, to our knowledge this approach has not been evaluated previously. Our results suggest that this method merits further consideration, particularly because of an indication that it may have higher power than the contingency test under data‐poor conditions. One caveat: the values in Table 3 (critical number of correct assignments for nominal α levels) are straightforward to calculate if all samples are of equal size but more complicated when sampling is unbalanced.

Direct comparison of the percentage of correct assignments in our results with those reported by Cornuet et al. (1999) is difficult because the latter study did not consider migration (only different times of isolation) and only evaluated the case of n = 10 subpopulations and N = 1000. Nevertheless, Cornuet et al. (1999) found that ∼100% correct assignments can be obtained using Rannala & Mountain's (1997) method with S = 30–50, L = 10 microsatellite loci, and FST≈ 0.1 (compare with results for parameter sets Hi‐1, 25S‐1, and 10 L‐1, which show the percentage of correct assignments ranging from 98% to 100% for simulations with S≥ 25, L≥ 10, and inline image≈ 0.13; Appendix I).

It should be recognized that the high power to detect small departures from panmixia is something of a two‐edged sword: if the test can detect very weak population structure, it can also confuse small artefacts (e.g. nonrandom sampling, family structure, data errors) with a true signal of population differentiation (Waples 1998). As a consequence, various sources of noise that might otherwise be safely ignored assume a relatively greater importance. This reality argues for careful attention to experimental design, sampling protocols, and data quality control. Furthermore, it emphasizes the importance of understanding the biology of the target species so that potential sampling artefacts can be avoided as much as possible.

Estimating the number of populations

The Bayesian approach for clustering groups of individuals implemented in baps proved to be very conservative in identifying population structure; different gene pools could only be detected reliably under very restricted migration (Nm = 1; inline image > 0.13). The reason for this is not clear; possible explanations include: (i) the penalty in baps for postulating additional populations (and hence estimating additional parameters) is too severe; or (ii) recent migrants might have obscured differences among populations (J. Corander, personal communication). When we used the ‘cluster individuals’ option (in which case the analysis is similar to that performed by structure) and Nm = 5, baps was more reliable at estimating the true number of populations, with performance comparable to that of structure (unpublished data).

In contrast, pairwise, multilocus contingency tests proved to be quite powerful at estimating the number of populations. Across all replicates, 100% of the populations were detected (every pairwise rxc test significant at the P < 0.01 level) under the standard parameter set with n = 2, 4, or 8 populations and Nm = 5, even with reduced samples of loci and individuals (Fig. 7). With High mutation markers and high gene flow (Nm = 25) or Low mutation markers and more restricted gene flow (Nm = 5), all of the pairwise comparisons were significant in at least 70% of the replicates. Results for the panmictic data sets indicate that this result reflects real power to detect population structure rather than an inflated type I error rate. With respect to the questions of primary interest here, the most important concern regarding multiple testing is not minimizing the familywise error rate (FWER; the probability of even a single false positive test), which is typically accomplished by a Bonferroni correction (e.g. Rice 1989), but rather the false discovery rate (FDR; the fraction of tests in which the null hypothesis is falsely rejected; Benjamini & Hochberg 1995). The FDR recaptures much of the power sacrificed by Bonferroni approaches, especially when a large number of hypotheses are tested (Garcia 2004; Verhoeven et al. 2005), and certain types of positive dependence among the tests can be accommodated (Benjamini & Yekutieli 2001). Even after adjusting for multiple testing, however, to estimate the number of discrete populations requires a set of rules to integrate information from the n(n– 1)/2 pairwise comparisons of samples. Figure 2 illustrates one possible ad hoc algorithm, but this topic clearly merits more rigorous evaluation.

When it is not possible to partition individuals into a priori samples (or when the basis for doing so is of uncertain validity), it is necessary to use an approach that clusters individuals without reference to sample information. We chose the most widely used clustering program (structure) to represent this class of analyses. The authors (Pritchard et al. 2000; Falush et al. 2003) admit that the procedure to estimate the number of populations is ad hoc and recommend that it be used only as a guide, but these caveats are often ignored. Previous assessments of the performance of structure (Evanno et al. 2005) have focused on situations involving strong differentiation. In agreement with those results, we found that structure accurately identified the number of populations when Nm was 5 or lower, mutation was High, and full samples of loci and individuals were used, but performance deteriorated sharply under less ideal conditions (Fig. 7). The complete inability of structure to correctly estimate the true number of populations using Low mutation markers is somewhat surprising but in agreement with previous observation regarding the factors primarily responsible for statistical power to detect population differentiation. Reduced samples of loci and individuals also affected performance, although not as dramatically as did the type of markers. We note, however, that (assuming Nm is low enough to permit adequate resolution), high power can be achieved using a sampling regime (L = 20 and S = 50) that is within the range achievable by many molecular ecology laboratories.

The method we found to be most powerful for identifying the number of populations (a simple algorithm based on the multilocus contingency test) is also the least sophisticated. However, caution must be used in comparing this test with approaches that cluster individuals rather than samples, because performance of the former depends on the premise that each sample has been taken randomly from a single population. rxc (or any other method based on comparison of a priori samples) cannot detect hidden structure within samples and can produce misleading conclusions if any of the samples include individuals from more than one biological unit.

None of the methods adequately estimated the true number of populations with Low mutation markers and small samples of loci and individuals. This result should be a caution to those wanting to draw inferences about the number of gene pools based on limited data.

Comparison of our results with those of Evanno et al. (2005) highlights the importance of including data sets with weak genetic differentiation in sensitivity analyses. Evanno et al. found that Δk performed better than the original approach proposed by Pritchard et al. (2000) for estimating the true number of populations. However, Evanno et al. only considered scenarios with strong genetic differentiation (FST = 0.15–0.4) — much higher than the range considered in our analyses of structure (inline image = 0.005–0.136). Levels of differentiation we considered are within the range of values observed for the majority of natural populations that have been studied (e.g. Bohonak 1999; Fig. 1). Therefore, results from simulation studies that only consider strong genetic differentiation can lead to conclusions about performance that are overly optimistic for many realistic applications. However, because we only considered a simple island model of migration (Evanno et al. considered hierarchically structured populations) and used relatively few trials of structure for each k value, our results comparing the two methods should be regarded as preliminary. Indeed, the Δk approach may work best with population structures other than the island model (J. Goudet, personal communication).

An important point to keep in mind is that a large variance in ln[Pr(X | k)] across different trial runs indicates that the MCMC chain has not converged. We found a large variance in ln[Pr(X | k)] among trials to be common in data sets with weak genetic differentiation. This result argues for considerable caution when interpreting the results of clustering programs such as structure for species whose biology suggests high dispersal abilities. Since convergence of the chain depends on characteristics of the data set being analysed, the best practice is to compare results for replicate runs. If results are not consistent, the length of the chain should be increased; if all efforts fail to result in convergence, this should be reported with the results.

Testing levels of gene flow

When the operational population concept requires more than simply testing for panmixia, methods based on CIs for inline image or related indices can be used to test specific hypotheses about restrictions to gene flow. As shown in Fig. 5, these tests can also have high power provided that the true level of gene flow is no more than about half of the critical level (the difference must be larger if Low mutation markers or restricted samples of individuals or loci are used). These tests require that one postulate a value for E(θ) corresponding to the hypothesized level of gene flow one wants to evaluate. Because E(θ) depends on mutation rate, particularly when migration is low (Balloux & Lugon‐Moulin 2002), these tests can in theory alleviate some of the problems associated with interpretation of highly variable markers pointed out by Hedrick (1999). However, several important caveats need to be mentioned.

First, equation 2 provides an approximation for E(θ) based on a simple migration model under the assumption that m and u are ‘small’. Some features of the island model are relatively robust to violation of underlying assumptions (Rousset 2003), but it is widely recognized that in some cases FST and analogues can provide misleading information about migration and gene flow (Waples 1998; Whitlock & McCauley 1999), particularly when migration is unbalanced. Furthermore, E(θ) depends on several key parameters (N, u, n) whose true values are generally unknown. In our model, the number of subpopulations sampled was the same as the true number (n), but often this will not be the case. Unsampled ‘ghost’ populations can affect gene flow estimates among the sampled populations in complex ways (Beerli 2004; Slatkin 2005). Collectively, these factors mean that in practice it will be difficult to obtain a reliable E(θ) for testing a particular level of gene flow.

Second, equation 2 assumes an equilibrium between drift, mutation, and migration. Although FST and θ approach equilibrium relatively quickly when migration rate is high, this process can still take tens or hundreds of generations. Furthermore, FST or θ by itself cannot distinguish genetic differences that arise due to a migration–drift balance from those that accumulate over time in completely isolated populations. These two scenarios might have very different implications for the concept of what a population is, particularly under the ecological paradigm. Recently developed methods have the potential to distinguish them in some cases (Hey & Nielsen 2004).

On a more technical note, several methods for estimating θ are available. Although the most commonly used method (and the one used here; Weir & Cockerham 1984) is generally the least biased, other estimators have smaller variance (Weir & Hill 2002). Based on results of computer simulations, Raufaste & Bonhomme (2000) recommended use of Weir and Cockerham's inline image when differentiation is strong but favoured a bias‐corrected version of Robertson & Hill's inline image (1984) when population subdivision is weak.

Although comparing the number of correct assignments with the random expectation appears to be a powerful method of detecting departures from panmixia, the percentage of correct assignments is not a reliable indicator of the degree of population subdivision. Percentage of correct assignment is strongly affected by marker type and more weakly by sample size, population size, number of populations, and number of loci (Fig. 6; Appendix I). As a consequence, any particular percentage of correct assignments could be consistent with a wide variety of true Nm values.

Testing migration rate

Quantitative evaluation of the concept of ‘population’ under the ecological paradigm is challenging for two major reasons. First, the relationship between migration rate and demographic independence is poorly understood. The value m = 0.1 for Criterion EC1 is a rough approximation based on a simple model; real metapopulations will typically be more complex, with population synchrony being a function of both migration rate and correlated environmental fluctuations (Lande et al. 1999). Furthermore, migrant individuals might not be equivalent to local ones in terms of behaviour, life history, etc., which means that m by itself will not necessarily be a reliable indication of the magnitude of demographic interactions.

Second, genetic methods have an inherent difficulty in evaluating the concept of population under the ecological paradigm; demographic independence depends on m, whereas the magnitude of genetic differentiation scales with the product Nm. In part because of this difficulty, recently developed likelihood models that can estimate m and Ne separately have attracted a great deal of interest. However, the coalescent approach of Beerli & Felsenstein (2001) has some significant limitations: it is computationally intensive and currently not feasible to use with many typical data sets; it estimates migration rates on an evolutionary time scale that is not directly relevant to the ecological paradigm; and an empirical evaluation (Abdo et al. 2004) indicates that the method performs poorly at estimating migration rates and their confidence intervals. The method of Wang & Whitlock (2003) estimates a contemporary migration rate but requires at least two temporally spaced sets of samples and assumes a migration model that is not realistic for most natural systems. Consequently, although both of these models have the potential to provide important insights into population structure under some circumstances, neither was evaluated in this study.

In some cases, assignment tests also have reasonable power to detect migrant individuals (Paetkau et al. 2004), and in principle this provides a basis for estimating a contemporary migration rate by taking advantage of naturally occurring ‘genetic marks’ of individuals. A limitation of this approach is that the probability of detecting migrants (and hence the estimated migration rate) can depend heavily on the choice of type I and type II error rates (Paetkau et al. 2004). This suggests that an assignment method that directly estimates a population‐level migration rate might be more powerful and less biased. A Bayesian method to estimate contemporary m directly was recently proposed by Wilson & Rannala (2003), who also carried out a simulation study in which they considered two populations and a range of migration rates (m = 0.01–0.20) that encompass Criterion EC1 (m < 0.1) for demographic independence. Their results indicate that reliable estimates of m can be obtained when differentiation is strong (FST ∼ 0.25) and sampling is adequate (L = 20; S = 100), but large biases are observed with insufficient data, particularly for high m (FST = 0.01). A more thorough evaluation of Wilson & Rannala's method (2003) is needed before being able to determine whether it is suitable for estimating migration rates relevant to the ecological paradigm. In particular, it is necessary to further explore the effect of genetic differentiation and investigate the effects of population size, number of actual (and sampled) populations, and the prior distribution for .

Bentzen (1998) suggested one solution to the problem of drawing demographic conclusions from genetic data: he reasoned that if m is large enough to lead to demographic dependence, Nm will generally be so large that the genetic signal will be very weak and genetic methods would not be able to reject the hypothesis of panmixia. He argued therefore that if genetic data reveal a significant and reproducible difference between populations (no matter how small), this provides strong evidence that the populations are demographically independent. Our results suggest that such a conclusion can be risky; if an adequate number of highly variable genetic markers are available, genetic structure can be detected consistently even with migration rates as high or higher (m = 0.1–0.2) than levels generally thought to lead to correlated demographic trajectories. For example, in the parameter set Hi‐100 (N = 500 and m = 0.2), Nm was 100 migrants per generation and mean inline image was only 0.0014, yet significant population subdivision (P < 0.05) was detected over half the time (Appendix I). Based on criterion EC1 (m < 0.1), this would represent a type I error rate of > 50%. When N is very large, however, such as marine fish stocks that were the focus of Bentzen's 1998 evaluations, migration rates of 10–20% would result in very high Nm values (and even smaller inline image) and hence a lower type I error rate under conditions considered here. For very large populations therefore a significant (and repeatable) test of genetic differentiation still might be a reliable indication that migration is below the threshold for demographic independence — at least until enough highly variable markers become available to provide arbitrarily high power to detect even smaller genetic differences.

Limitations of this study

Our ability to conduct in‐depth evaluations has been constrained by the huge potential parameter space and the large number of methods available. Therefore, several limitations of the current study should be kept in mind in interpreting the results.

First, we considered only a simple island model with constant population sizes and constant, symmetrical migration, which are unlikely in natural systems. Continuously distributed species with no apparent population boundaries would present special challenges for any of the methods described here. Similarly, population structures characterized by isolation by distance or hierarchical migration patterns could lead to qualitatively different results than are presented here.

Second, we assumed selective neutrality, in which case the nominal migration rate (m) is also the effective migration rate. In many cases, however, migrants will be at a selective disadvantage (Nosil et al. 2005) (or, alternatively, at a selective advantage; Ebert et al. 2002) compared to local individuals. Furthermore, different genes will experience different selective pressures and hence different rates of effective migration (Rieseberg et al. 1996; Chan & Levin 2005); as a result, measures of genetic differentiation, and results of tests based on population criteria like those suggested here, might differ depending on which gene loci are surveyed. This reality argues for careful consideration not only in the choice of population criteria but also in evaluating results of genetic analyses.

Third, we considered only codominant nuclear loci. Although many standard genetic analyses such as those described here can be easily modified to accommodate haploid DNA data from mitochondria or chloroplasts, maternally inherited markers can provide qualitatively different types of information about population structure. For the ecological paradigm, it is important to note that recruitment and population growth is contingent on (and typically limited by) female reproductive success. Because of this reality, Avise (1995) argued that mtDNA data should be given special consideration in studies of population structure, since evidence for strong female philopatry implies demographic independence on ecological time frames.

Fourth, the island model used here, and indeed most population genetics models, assumes discrete generations, which apply to relatively few species. Rannala & Hartigan (1996) described a method that allows estimation of a gene flow parameter in species with overlapping generations, but this topic needs additional investigation.

Finally, in nonequilibrium situations, the ecological and evolutionary paradigms can lead to different conclusions about population structure, for both conceptual and technical reasons. Are historically panmictic but recently isolated entities populations? Does the answer differ depending on whether it is viewed from the ecological or the evolutionary paradigm? Demographic decoupling occurs as soon as immigration stops, whereas genetic measures will reflect historical connectivity even if no gene flow occurs at present. Therefore, a measure of contemporary migration rate (based on marked individuals) could potentially detect the decoupling and provide information relevant to the ecological paradigm, even in the absence of meaningful genetic differences at the population level.

Summary and future directions

It is apparent from a review of the literature that no consensus has emerged regarding a quantitative definition of ‘population’. This is not necessarily a fatal problem; the concept of ‘population’ is meaningful under each of the paradigms discussed and, potentially, at various hierarchical levels within each paradigm. It seems reasonable that a variety of criteria could be appropriate to analyse this diversity of population concepts. We have suggested quantitative criteria that could be used to define populations under both the evolutionary and ecological paradigms. The suggested criteria are not exhaustive but might serve as a starting point for further discussions and evaluations. Results presented here suggest a number of topics that could form the basis for future research projects. These include:

Assignment tests and population differentiation. It appears that comparing the number of correct assignments with the random expectation can be a powerful means of detecting departures from panmixia (if not absolute levels of population differentiation). It would be useful to compare performance of this method and the multilocus contingency test under a wider variety of scenarios (especially unbalanced sampling and asymmetrical migration).

Detecting the number of populations. The surprising power of the pairwise contingency test approach to detect population structure is a good incentive to find a more rigorous solution to the problem of lack of independence of different pairwise tests. Even after adjusting for multiple testing, an algorithm is still needed to translate all the pairwise results into inferences about the number of component gene pools. The ad hoc method proposed here (Fig. 2) is conceptually very similar to Population Aggregation Analysis, which is used to amalgamate populations to arrive at units that can be considered ‘species’ under the Phylogenetic Species Concept (Davis & Nixon 1992). Nevertheless, it seems likely that more sophisticated approaches than the simple one suggested here will prove to be more robust and powerful.

Methods based on clustering individuals (without a priori information about sample locations) have limited power when gene flow is moderate or high. We used structure as a representative of this type of analysis, but this is an active area of research and several other competing programs are available (e.g. Dawson & Belkhir 2001; Corander et al. 2004; Guillot et al. 2005). Therefore, comparative analyses of these methods are needed. More detailed evaluations are also needed to better describe parameter spaces that result in high vs. low power for this class of analyses. This is particularly true for nested or hierarchical models of migration, which Evanno et al. evaluated for low gene flow scenarios. A more thorough evaluation of the performance of Evanno et al.'s Δk method under moderate and high gene flow is also needed.

Ecological paradigm. The ecological population paradigm remains challenging to analyse using genetic data. Recent theoretical developments offer some promise that this may change in the future if Moore's law (computational power doubles every 18 months) continues to hold and models continue to be refined and made more biologically realistic.

Acknowledgements

We are indebted to Mark Miller, who modified his rxc program to accommodate multiple data sets and multiple gene loci. We also thank Jérôme Goudet for sharing an unpublished manuscript, Silvain Piry for providing a version of geneclass2 capable of batch processing many data sets, and Ryan Waples for valuable assistance in generating and analysing data used in this report. Jukka Corander, Pip Courbois, Jérôme Goudet, Lorenz Hauser, Mark Miller, Mary Ruckelshaus, Matthew Stephens, Koen Verhoeven, and an anonymous reviewer provided useful comments and discussion. O.E.G. acknowledges the support of the Fond National de la Science (grant ACI‐IMPBio‐2004–42‐PGDA). Finally, we are grateful to Louis Bernatchez for encouraging this work.

    Footnotes

    • 1 Numerous variations on population terminology and definitions (e.g. ‘deme’, ‘subpopulation’, ‘stock’; Table 1) have also appeared in the literature. We will not attempt to address these terms here, except to note that they could be evaluated using the same general framework adopted here for ‘population.

    Appendices

    Appendix I

    Table 4. Detailed results of analysis of simulated data, using multilocus contingency tests (rxc), classical assignment tests (Rannala & Mountain 1997) and F‐statistics (inline image; Weir and Cockerham 1984). Results reflect data for 100 replicates except for parameter sets Hi‐P and Lo‐P, for which 1000 replicates were used. Data in bold are empirical type I error rates for the nominal a level. See Table 2 for input parameters for each parameter set
    Param. set Contingeny test percent significant Assignment tests inline image E(θ) Percentage of replicates rejecting H0 as shown
    Percent correct Percentage of replicates # correct > random Panmixia Nm≥ 25 Nm≥ 5 Nm≥ 1
    0.05 0.01 0.001 0.05 0.01 0.001 0.05 0.01 0.05 0.01 0.05 0.01 0.05 0.01
    Hi‐P 4.9 0.9 0.1 24.6 9.5 3.1 0.5 0.000 0.000 9.3 2.3 0 0 0 0 0 0
    Hi‐25 100 100 100 48.7 100 100 100 0.006 0.007 100 100 0 0 0 0 0 0
    Hi‐5 100 100 100 88.7 100 100 100 0.033 0.035 100 100 100 100 1 0 0 0
    Hi‐1 100 100 100 99.6 100 100 100 0.136 0.136 100 100 100 100 100 100 2 0
    Hi‐0.1 100 100 100 100.0 100 100 100 0.376 0.395 100 100 100 100 100 100 100 100
    Lo‐P 5.0 1.0 0 24.9 8.6 1.5 0.3 0.000 0.000 5.6 1.8 0 0 0 0 0 0
    Lo‐25 79 64 38 32.5 76 51 29 0.007 0.007 60 36 3 0 0 0 0 0
    Lo‐5 100 100 100 49.8 100 100 100 0.035 0.036 99 99 89 74 2 0 0 0
    Lo‐1 100 100 100 85.4 100 100 100 0.160 0.158 100 100 100 100 100 99 2 0
    Lo‐0.1 100 100 100 99.9 100 100 100 0.693 0.652 100 100 100 100 100 100 100 100
    100N‐25 92 80 63 36.2 92 78 65 0.004 0.007 76 63 0 0 0 0 0 0
    100N‐5 100 100 100 71.5 100 100 100 0.032 0.036 100 100 100 100 3 0 0 0
    100N‐1 100 100 100 96.7 100 100 100 0.150 0.153 100 100 100 100 100 100 2 0
    2n‐25 82 58 34 64.2 85 72 55 0.004 0.005 49 26 1 0 0 0 0 0
    2n‐5 100 100 100 87.1 100 100 100 0.023 0.024 100 100 100 94 1 0 0 0
    2n‐1 100 100 100 99.3 100 100 100 0.097 0.100 100 100 100 100 100 100 1 0
    8n‐25 100 100 100 39.2 100 100 100 0.008 0.009 100 100 0 0 0 0 0 0
    8n‐5 100 100 100 89.3 100 100 100 0.039 0.040 100 100 100 100 2 1 0 0
    8n‐1 100 100 100 99.6 100 100 100 0.147 0.152 100 100 100 100 100 100 1 0
    10L‐25 100 100 100 42.4 100 100 98 0.007 0.007 99 92 2 1 0 0 0 0
    10L‐5 100 100 100 77.2 100 100 100 0.034 0.035 100 100 100 100 1 1 0 0
    10L‐1 100 100 100 98.3 100 100 100 0.137 0.136 100 100 100 100 100 100 5 1
    25S‐25 98 93 67 43.4 98 94 74 0.007 0.007 89 72 1 0 0 0 0 0
    25S‐5 100 100 100 84.5 100 100 100 0.034 0.035 100 100 100 100 5 0 0 0
    25S‐1 100 100 100 99.5 100 100 100 0.136 0.136 100 100 100 100 100 100 3 2
    C‐25 18 5 1 27.4 24 13 3 0.005 0.007 10 7 1 0 0 0 0 0
    C‐5 91 86 69 40.3 91 82 60 0.034 0.036 71 52 46 27 4 2 0 0
    C‐1 100 100 100 72.6 100 100 100 0.164 0.158 100 100 100 97 94 83 4 2
    Hi‐100 56 33 15 31.0 55 39 17 0.0014 0.0019 45 24 0 0 0 0 0 0
    Hi‐50 98 92 77 37.5 98 88 71 0.003 0.004 92 85 0 0 0 0 0 0
    200N‐20 99 99 99 46.9 99 99 99 0.008 0.009 99 98 1 1 0 0 0 0
    200N‐10 100 100 100 63.5 100 100 100 0.016 0.018 100 100 63 47 1 0 0 0
    200N‐2 100 100 100 95.2 100 100 100 0.080 0.083 100 100 100 100 100 100 1 0
    50N‐5 100 100 100 58.9 100 100 100 0.029 0.036 100 100 0 0 0 0 0 0
    50N‐2.5 100 100 100 74.6 100 100 100 0.063 0.069 100 100 60 40 0 0 0 0
    50N‐0.5 100 100 100 96.9 100 100 100 0.267 0.265 100 100 100 100 100 100 4 2

    Appendix II

    Estimating the number of populations using structure. Each panel shows variation across 10 replicate data sets in ln[P(X|k)] plotted as a function of the putative number of populations (k). For each replicate, results were averaged across five trial runs and scaled to the maximum value within that replicate. The true number of populations was n = 4 and other parameters were as in the standard model; the level of gene flow (Nm) varied as shown in the three panels.

    inline image

    Appendix III

    As in Appendix II, except that plotted values use the Δk method proposed by Evanno et al. (2005).

    inline image

    Robin Waples is interested in developing and applying population genetic principles to real‐world problems in ecology, conservation, and management. His research focuses on population genetics and conservation genetics of marine and anadromous fishes. Oscar Gaggiotti's research focuses on developing theory and statistical methods aimed at bridging the gap between population ecology, population genetics and evolution. Much of his research is applied to the study of metapopulations.

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    • , Genetic isolation between coastal and fishery‐impacted, offshore bottlenose dolphin (Tursiops spp.) populations, Molecular Ecology, 25, 12, (2735-2753), (2016).
    • , Genomic data reveal ancient microendemism in forest scorpions across the California Floristic Province, Molecular Ecology, 25, 15, (3731-3751), (2016).
    • , Using demographic attributes from long‐term monitoring data to delineate natural population structure, Journal of Applied Ecology, 53, 2, (491-500), (2015).
    • , Assessing polar bear (Ursus maritimus) population structure in the Hudson Bay region using SNPs, Ecology and Evolution, 6, 23, (8474-8484), (2016).
    • , Contrasting dispersal inference methods for the greater white‐toothed shrew, The Journal of Wildlife Management, 80, 5, (812-823), (2016).
    • , Local endemism and within‐island diversification of shrews illustrate the importance of speciation in building Sundaland mammal diversity, Molecular Ecology, 25, 20, (5158-5173), (2016).
    • , Identifying outlier loci in admixed and in continuous populations using ancestral population differentiation statistics, Molecular Ecology, 25, 20, (5029-5042), (2016).
    • , Conservation genomics of natural and managed populations: building a conceptual and practical framework, Molecular Ecology, 25, 13, (2967-2977), (2016).
    • , Genetic and phenotypic variation in central and northern European populations of Aedes (Aedimorphus) vexans (Meigen, 1830) (Diptera, Culicidae), Journal of Vector Ecology, 41, 1, (160-171), (2016).
    • , Genetic structure among remnant populations of a migratory passerine, the Northern Wheatear Oenanthe oenanthe, Ibis, 158, 4, (857-867), (2016).
    • , Feral Cat Globetrotters: genetic traces of historical human‐mediated dispersal, Ecology and Evolution, 6, 15, (5321-5332), (2016).
    • , Genetic reconstruction of a bullfrog invasion to elucidate vectors of introduction and secondary spread, Ecology and Evolution, 6, 15, (5221-5233), (2016).
    • , Genotyping-by-sequencing provides the discriminating power to investigate the subspecies of Daucus carota (Apiaceae), BMC Evolutionary Biology, 16, 1, (2016).
    • , Population or Point-of-Origin Identification, Seafood Authenticity and Traceability, 10.1016/B978-0-12-801592-6.00008-5, (149-169), (2016).
    • , Lessons learned from practical approaches to reconcile mismatches between biological population structure and stock units of marine fish, ICES Journal of Marine Science: Journal du Conseil, (fsw188), (2016).
    • , A Parallel Population Genomic and Hydrodynamic Approach to Fishery Management of Highly-Dispersive Marine Invertebrates: The Case of the Fijian Black-Lip Pearl Oyster Pinctada margaritifera, PLOS ONE, 11, 8, (e0161390), (2016).
    • , Genetic inference of demographic connectivity in the Atlantic European hake metapopulation ( Merluccius merluccius ) over a spatio-temporal framework, Fisheries Research, 179, (291), (2016).
    • , Using a multi-disciplinary approach to identify a critically endangered killer whale management unit, Ecological Indicators, 66, (291), (2016).
    • , Two decades of genetic consistency in a reproductive population in the face of exploitation: patterns of adult and larval walleye (Sander vitreus) from Lake Erie’s Maumee River, Conservation Genetics, 17, 6, (1345), (2016).
    • , Panmixia in a Critically Endangered Fish: The Totoaba (Totoaba macdonaldi) in the Gulf of California, Journal of Heredity, 107, 6, (496), (2016).
    • , Spatial genetic subdivision among populations of the highly migratory black marlin Istiompax indica within the central Indo-Pacific, Marine and Freshwater Research, 67, 8, (1205), (2016).
    • , Does asymmetric gene flow among matrilines maintain the evolutionary potential of the European eel?, Ecology and Evolution, 6, 15, (5305-5320), (2016).
    • , Genetic analyses of wild bison in Alberta, Canada: implications for recovery and disease management, Journal of Mammalogy, 97, 6, (1525), (2016).
    • , Population genomic data delineate conservation units in mottled ducks ( Anas fulvigula ), Biological Conservation, 203, (272), (2016).
    • , Genetic diversity analysis of spawner and recaptured populations of Chinese shrimp (Fenneropenaeus chinensis) during stock enhancement in the Bohai Bay based on an SSR marker, Acta Oceanologica Sinica, 35, 8, (51), (2016).
    • , Genetic connectivity and self-replenishment of inshore and offshore populations of the endemic anemonefish, Amphiprion latezonatus, Coral Reefs, 35, 3, (959), (2016).
    • , A decade of seascape genetics: contributions to basic and applied marine connectivity, Marine Ecology Progress Series, 10.3354/meps11792, 554, (1-19), (2016).
    • , Salinity and hydrological barriers have little influence on genetic structure of the mosquitofish in a coastal landscape shaped by climate change, Hydrobiologia, 777, 1, (209), (2016).
    • , Three Molecular Markers Show No Evidence of Population Genetic Structure in the Gouldian Finch (Erythrura gouldiae), PLOS ONE, 11, 12, (e0167723), (2016).
    • , A primer for use of genetic tools in selecting and testing the suitability of set-aside sites protected from deep-sea seafloor massive sulfide mining activities, Ocean & Coastal Management, 10.1016/j.ocecoaman.2016.01.007, 122, (37-48), (2016).
    • , Identifying populations for management: fine-scale population structure in the New Zealand alpine rock wren (Xenicus gilviventris), Conservation Genetics, 10.1007/s10592-016-0815-8, 17, 3, (691-701), (2016).
    • , Genetic stock composition of marine bycatch reveals disproportional impacts on depleted river herring genetic stocks, Canadian Journal of Fisheries and Aquatic Sciences, 73, 6, (951), (2016).
    • , The Gulf of Ambracia's Common Bottlenose Dolphins, Tursiops truncatus, Mediterranean Marine Mammal Ecology and Conservation, 10.1016/bs.amb.2016.07.002, (259-296), (2016).
    • , Integrating ecological and genetic structure to define management units for caribou in Eastern Canada, Conservation Genetics, 17, 2, (437), (2016).
    • , Genetic Stock Structure of Anadromous Arctic Char in Canada's Central Arctic: Potential Implications for the Management of Canada's Largest Arctic Char Commercial Fishery, North American Journal of Fisheries Management, 36, 6, (1473-1488), (2016).
    • , Dispersal in the sub-Antarctic: king penguins show remarkably little population genetic differentiation across their range, BMC Evolutionary Biology, 10.1186/s12862-016-0784-z, 16, 1, (2016).
    • , Scallop Genetics and Genomics, Scallops - Biology, Ecology, Aquaculture, and Fisheries, 10.1016/B978-0-444-62710-0.00009-2, (371-424), (2016).
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    • , The life aquatic: advances in marine vertebrate genomics, Nature Reviews Genetics, 17, 9, (523), (2016).
    • , Variation in morphology and life-history strategy of an exploited sparid fish, Marine and Freshwater Research, 67, 10, (1434), (2016).
    • , Patterns of population structure and dispersal in the long-lived “redwood” of the coral reef, the giant barrel sponge (Xestospongia muta), Coral Reefs, 35, 3, (1097), (2016).
    • , Evaluation of the prediction skill of stock assessment using hindcasting, Fisheries Research, 10.1016/j.fishres.2016.05.017, 183, (119-127), (2016).
    • , Navigating the currents of seascape genomics: how spatial analyses can augment population genomic studies, Current Zoology, 10.1093/cz/zow067, 62, 6, (581-601), (2016).
    • , Contradictory genetic make-up of Dutch harbour porpoises: Response to van der Plas-Duivesteijn et al., Journal of Sea Research, 108, (60), (2016).
    • , Gene flow and genetic structure of the puma and jaguar in Mexico, European Journal of Wildlife Research, 62, 4, (461), (2016).
    • , Spatial genetic structure in the saddled sea bream (Oblada melanura [Linnaeus, 1758]) suggests multi-scaled patterns of connectivity between protected and unprotected areas in the Western Mediterranean Sea, Fisheries Research, 176, (30), (2016).
    • , Outlier Loci Detect Intraspecific Biodiversity amongst Spring and Autumn Spawning Herring across Local Scales, PLOS ONE, 11, 4, (e0148499), (2016).
    • , Influence of geomorphology and surface features on the genetic structure of an important trogloxene, the secret cave cricket (Ceuthophilus secretus), Conservation Genetics, 17, 4, (969), (2016).
    • , High connectivity in a long-lived high-Arctic seabird, the ivory gull Pagophila eburnea, Polar Biology, 39, 2, (221), (2016).
    • , Genetic analyses reveal declining trends and low effective population size in an overfished South African sciaenid species, the dusky kob (Argyrosomus japonicus), Marine and Freshwater Research, 67, 2, (266), (2016).
    • , Accurate continuous geographic assignment from low- to high-density SNP data, Bioinformatics, 32, 7, (1106), (2016).
    • , Nuclear and Mitochondrial DNA Analyses of Golden Eagles (Aquila chrysaetos canadensis) from Three Areas in Western North America; Initial Results and Conservation Implications, PLOS ONE, 11, 10, (e0164248), (2016).
    • , Fine-scale genetic population structure of loggerhead turtles in the Northwest Pacific, Endangered Species Research, 30, (83), (2016).
    • , Population structure of species: Eco-geographic units and genetic differentiation between populations, Russian Journal of Marine Biology, 42, 5, (373), (2016).
    • , Bio-physical connectivity patterns of benthic marine species used in the designation of Scottish nature conservation marine protected areas, ICES Journal of Marine Science: Journal du Conseil, (fsw174), (2016).
    • , Genetically distinct populations of a diatom co‐exist during the North Atlantic spring bloom, Limnology and Oceanography, 61, 6, (2165-2179), (2016).
    • , Implications for management and conservation of the population genetic structure of the wedge clam Donax trunculus across two biogeographic boundaries, Scientific Reports, 10.1038/srep39152, 6, 1, (2016).
    • , Genetic structure of a disjunct peripheral population of mountain sucker Pantosteus jordani in the Black Hills, South Dakota, USA, Conservation Genetics, 17, 4, (775), (2016).
    • , Complex post-larval dispersal processes in Atlantic cod revealed by age-based genetics and relatedness analysis, Marine Ecology Progress Series, 556, (237), (2016).
    • , Design of a 9K illumina BeadChip for polar bears (rsus maritimus) from RAD and transcriptome sequencing, Molecular Ecology Resources, 15, 3, (587-600), (2014).
    • , Identifying designatable units for intraspecific conservation prioritization: a hierarchical approach applied to the lake whitefish species complex (oregonus spp.), Evolutionary Applications, 8, 5, (423-441), (2015).
    • , Establishing the evolutionary compatibility of potential sources of colonizers for overfished stocks: a population genomics approach, Molecular Ecology, 24, 3, (564-579), (2015).
    • , Habitat fragmentation in coastal southern California disrupts genetic connectivity in the cactus wren (ampylorhynchus brunneicapillus), Molecular Ecology, 24, 10, (2349-2363), (2015).
    • , A Comparison of Connectivity Metrics on Watersheds and Implications for Water Management, River Research and Applications, 31, 2, (256-267), (2014).
    • , Genetic differentiation in the ice‐dependent fish Pleuragramma antarctica along the Antarctic Peninsula, Journal of Biogeography, 42, 6, (1103-1113), (2015).
    • , Ecological strategies predict associations between aquatic and genetic connectivity for dryland amphibians, Ecology, 96, 5, (1371-1382), (2015).
    • , Elucidation of population connectivity in synanthropic mesopredators: Using genes to define relevant spatial scales for management of raccoons and Virginia opossums, The Journal of Wildlife Management, 79, 1, (112-121), (2014).
    • , Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era, Evolutionary Applications, 8, 8, (769-786), (2015).
    • , Oceanography and life history predict contrasting genetic population structure in two Antarctic fish species, Evolutionary Applications, 8, 5, (486-509), (2015).
    • , Ocean's eleven: a critical evaluation of the role of population, evolutionary and molecular genetics in the management of wild fisheries, Fish and Fisheries, 16, 1, (125-159), (2013).
    • , Heterozygote deficits in cyst plant‐parasitic nematodes: possible causes and consequences, Molecular Ecology, 24, 8, (1654-1677), (2015).
    • , Population structure and dispersal of the coral‐excavating sponge Cliona delitrix, Molecular Ecology, 24, 7, (1447-1466), (2015).
    • , Seascape drivers of acrocystis pyrifera population genetic structure in the northeast Pacific, Molecular Ecology, 24, 19, (4866-4885), (2015).
    • , Low but significant genetic differentiation underlies biologically meaningful phenotypic divergence in a large Atlantic salmon population, Molecular Ecology, 24, 20, (5158-5174), (2015).
    • , Phylogeographic inference using Bayesian model comparison across a fragmented chorus frog species complex, Molecular Ecology, 24, 18, (4739-4758), (2015).
    • , Phylogeography of the smooth snake oronella austriaca (Serpentes: Colubridae): evidence for a reduced gene pool and a genetic discontinuity in Central Europe, Biological Journal of the Linnean Society, 115, 1, (195-210), (2015).
    • , Ecological explanations to island gigantism: dietary niche divergence, predation, and size in an endemic lizard, Ecology, 96, 8, (2077-2092), (2015).
    • , Translocated to the fringe: genetic and niche variation in bighorn sheep of the Great Basin and northern Mojave deserts, Diversity and Distributions, 21, 9, (1063-1074), (2015).
    • , Antarctic krill population genomics: apparent panmixia, but genome complexity and large population size muddy the water, Molecular Ecology, 24, 19, (4943-4959), (2015).
    • , RAD genotyping reveals fine‐scale genetic structuring and provides powerful population assignment in a widely distributed marine species, the American lobster (omarus americanus), Molecular Ecology, 24, 13, (3299-3315), (2015).
    • , Evaluating the resolution power of new microsatellites for species identification and stock delimitation in the Cape hakes Merluccius paradoxus and Merluccius capensis (Teleostei: Merlucciidae), Journal of Fish Biology, 86, 5, (1650-1657), (2015).
    • , Interpreting the flock algorithm from a statistical perspective, Molecular Ecology Resources, 15, 5, (1020-1030), (2015).
    • , Population genetic structure of Bellamya aeruginosa (Mollusca: Gastropoda: Viviparidae) in China: weak divergence across large geographic distances, Ecology and Evolution, 5, 21, (4906-4919), (2015).
    • , Revisiting the Iberian honey bee (pis mellifera iberiensis) contact zone: maternal and genome‐wide nuclear variations provide support for secondary contact from historical refugia, Molecular Ecology, 24, 12, (2973-2992), (2015).
    • , Landscape characteristics influencing the genetic structure of greater sage‐grouse within the stronghold of their range: a holistic modeling approach, Ecology and Evolution, 5, 10, (1955-1969), (2015).
    • , Lineage sorting in multihost parasites: Eidmanniella albescens and Fregatiella aurifasciata on seabirds from the Galapagos Islands, Ecology and Evolution, 5, 16, (3264-3271), (2015).
    • , Assessing spatial population structure and heterogeneity in the dronefly, Journal of Zoology, 297, 4, (286-300), (2015).
    • , A genetic discontinuity in moose (Alces alces) in Alaska corresponds with fenced transportation infrastructure, Conservation Genetics, 16, 4, (791), (2015).
    • , Prevalence and survival of escaped European seabass Dicentrarchus labrax in Cyprus identified using genetic markers, Aquaculture Environment Interactions, 10.3354/aei00135, 7, 1, (49-59), (2015).
    • , Genetic Variability and Structuring of Arctic Charr (Salvelinus alpinus) Populations in Northern Fennoscandia, PLOS ONE, 10, 10, (e0140344), (2015).
    • , Population connectivity and the effectiveness of marine protected areas to protect vulnerable, exploited and endemic coral reef fishes at an endemic hotspot, Coral Reefs, 34, 2, (393), (2015).
    • , The utility of genetics in marine fisheries management: a simulation study based on Pacific cod off Alaska, Canadian Journal of Fisheries and Aquatic Sciences, 72, 9, (1415), (2015).
    • , Spatial Heterogeneity as a Genetic Mixing Mechanism in Highly Philopatric Colonial Seabirds, PLOS ONE, 10, 2, (e0117981), (2015).
    • , Worldwide morphological variability in Mid-Pliocene menardellid globorotalids, Marine Micropaleontology, 10.1016/j.marmicro.2015.09.001, 121, (1-15), (2015).
    • , Broad-scale genetic patterns of New Zealand abalone, Haliotis iris, across a distribution spanning 13° latitude and major oceanic water masses, Genetica, 143, 4, (487), (2015).
    • , Assessing the Permeability of Landscape Features to Animal Movement: Using Genetic Structure to Infer Functional Connectivity, PLOS ONE, 10, 2, (e0117500), (2015).
    • , Genetic structure and consequences of stock exploitation of Chrysoblephus puniceus, a commercially important sparid in the South West Indian Ocean, Fisheries Research, 164, (64), (2015).
    • , Using multiple markers to elucidate the ancient, historical and modern relationships among North American Arctic dog breeds, Heredity, 115, 6, (488), (2015).
    • , Population structure of Hirundichthys oxycephalus in the northwestern Pacific inferred from mitochondrial cytochrome oxidase I gene, Zoological Studies, 54, 1, (2015).
    • , The origin and genetic divergence of “black” kokanee, a novel reproductive ecotype of Oncorhynchus nerka, Canadian Journal of Fisheries and Aquatic Sciences, 72, 10, (1584), (2015).
    • , Tigers of Sundarbans in India: Is the Population a Separate Conservation Unit?, PLOS ONE, 10, 4, (e0118846), (2015).
    • , Origin and Genetic Diversity of Lake Trout in the Togiak National Wildlife Refuge, Alaska, Journal of Fish and Wildlife Management, 6, 1, (130), (2015).
    • , Multilocus Bayesian Estimates of Intra-Oceanic Genetic Differentiation, Connectivity, and Admixture in Atlantic Swordfish (Xiphias gladius L.), PLOS ONE, 10, 6, (e0127979), (2015).
    • , New Nuclear SNP Markers Unravel the Genetic Structure and Effective Population Size of Albacore Tuna (Thunnus alalunga), PLOS ONE, 10, 6, (e0128247), (2015).
    • , Eastern Japanese Dictyostelia Species Adapt While Populations Exhibit Neutrality, Evolutionary Biology, 42, 2, (210), (2015).
    • , The genetic architecture of hybridisation between two lineages of greenshell mussels, Heredity, 114, 3, (344), (2015).
    • , Molecular ecology and stock identification, Freshwater Fisheries Ecology, (811-829), (2015).
    • , Characterization of Sugarcane Mosaic Virus Scmv1 and Scmv2 Resistance Regions by Regional Association Analysis in Maize, PLOS ONE, 10, 10, (e0140617), (2015).
    • , Genetic diversity, population genetic structure, and demographic history of Auxis thazard (Perciformes), Selar crumenophthalmus (Perciformes), Rastrelliger kanagurta (Perciformes) and Sardinella lemuru (Clupeiformes) in Sulu-Celebes Sea inferred by mitochondrial DNA sequences, Fisheries Research, 162, (64), (2015).
    • , Molecular assessment of translocation and management of an endangered subspecies of white-tailed deer (Odocoileus virginianus), Conservation Genetics, 16, 3, (635), (2015).
    • , Population genetic structure and disease in montane boreal toads: more heterozygous individuals are more likely to be infected with amphibian chytrid, Conservation Genetics, 16, 4, (833), (2015).
    • , From Shelf to Shelf: Assessing Historical and Contemporary Genetic Differentiation and Connectivity across the Gulf of Mexico in Gag, Mycteroperca microlepis, PLOS ONE, 10, 4, (e0120676), (2015).
    • , Evidence of discrete yellowfin tuna (Thunnus albacares) populations demands rethink of management for this globally important resource, Scientific Reports, 5, 1, (2015).
    • , Temporal Population Genetic Structure of Yellow Perch Spawning Groups in the Lower Great Lakes, Transactions of the American Fisheries Society, 144, 1, (211-226), (2015).
    • , Genetic Divergence of an Avian Endemic on the Californian Channel Islands, PLOS ONE, 10, 8, (e0134471), (2015).
    • , Influence of landscape features on spatial genetic structure of white‐tailed deer in human‐altered landscapes, The Journal of Wildlife Management, 79, 2, (180-194), (2015).
    • , Discordance between nuclear and mitochondrial DNA analyses of population structure in closely related triplefin fishes (Forsterygion lapillum and F. capito, F. Tripterygiidae) supports speciation with gene flow, Marine Biology, 162, 8, (1611), (2015).
    • , Complementarity of statistical treatments to reconstruct worldwide routes of invasion: the case of the Asian ladybird Harmonia axyridis, Molecular Ecology, 23, 24, (5979-5997), (2014).
    • , Integrating genetic data and population viability analyses for the identification of harbour seal (hoca vitulina) populations and management units, Molecular Ecology, 23, 4, (815-831), (2014).
    • , Range‐wide analysis of genetic structure in a widespread, highly mobile species (Odocoileus hemionus) reveals the importance of historical biogeography, Molecular Ecology, 23, 13, (3171-3190), (2014).
    • , Loss of genetic integrity in wild lake trout populations following stocking: insights from an exhaustive study of 72 lakes from Québec, Canada, Evolutionary Applications, 7, 6, (625-644), (2014).
    • , Response Variables for Evaluation of the Effectiveness of Conservation Corridors, Conservation Biology, 28, 3, (689-695), (2014).
    • , Matching oceanography and genetics at the basin scale. Seascape connectivity of the Mediterranean shore crab in the Adriatic Sea, Molecular Ecology, 23, 22, (5496-5507), (2014).
    • , Estimation of migration rates from marker‐based parentage analysis, Molecular Ecology, 23, 13, (3191-3213), (2014).
    • , Parentage and sibship inference from markers in polyploids, Molecular Ecology Resources, 14, 3, (541-553), (2013).
    • , Samples from subdivided populations yield biased estimates of effective size that overestimate the rate of loss of genetic variation, Molecular Ecology Resources, 14, 1, (87-99), (2013).
    • , Assessment of genetic structure among eastern North Pacific gray whales on their feeding grounds, Marine Mammal Science, 30, 4, (1473-1493), (2014).
    • , Genetic structure of populations of whale sharks among ocean basins and evidence for their historic rise and recent decline, Molecular Ecology, 23, 10, (2590-2601), (2014).
    • , Divergent population structure and climate associations of a chromosomal inversion polymorphism across the imulus guttatus species complex, Molecular Ecology, 23, 11, (2844-2860), (2014).
    • , Identifying conservation units after large‐scale land clearing: a spatio‐temporal molecular survey of endangered white‐tailed black cockatoos (Calyptorhynchus spp.), Diversity and Distributions, 20, 10, (1208-1220), (2014).
    • , Conservation genomics of anadromous Atlantic salmon across its North American range: outlier loci identify the same patterns of population structure as neutral loci, Molecular Ecology, 23, 23, (5680-5697), (2014).
    • , Genetic assessment of a summer chum salmon metapopulation in recovery, Evolutionary Applications, 7, 2, (266-285), (2013).
    • , Combining genetic and demographic information to prioritize conservation efforts for anadromous alewife and blueback herring, Evolutionary Applications, 7, 2, (212-226), (2013).
    • , A multi‐method approach for analyzing hierarchical genetic structures: a case study with cougars Puma concolor, Ecography, 37, 6, (552-563), (2014).
    • , Population structure and phylogeography reveal pathways of colonization by a migratory marine reptile (helonia mydas) in the central and eastern Pacific, Ecology and Evolution, 4, 22, (4317-4331), (2014).
    • , Challenges in analysis and interpretation of microsatellite data for population genetic studies, Ecology and Evolution, 4, 22, (4399-4428), (2014).
    • , Disparity in population structuring of Southwestern Willow Flycatchers based on geographic distance, movement patterns, and genetic analyses, Journal of Experimental Zoology Part A: Ecological Genetics and Physiology, 321, 10, (577-585), (2014).
    • , Panmixia defines the genetic diversity of a unique arthropod‐dispersed fungus specific to Protea flowers, Ecology and Evolution, 4, 17, (3444-3455), (2014).
    • , Determining population structure and hybridization for two iris species, Ecology and Evolution, 4, 6, (743-755), (2014).
    • , Fin whale ‐1 and allozyme variation is not reflected in the corresponding DNA sequences, Ecology and Evolution, 4, 10, (1787-1803), (2014).
    • , Is isolation by adaptation driving genetic divergence among proximate Dolly Varden char populations?, Ecology and Evolution, 4, 12, (2515-2532), (2014).
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    • , Low neutral genetic diversity in isolated Greater Sage-Grouse ( Centrocercus urophasianus ) populations in northwest Wyoming , The Condor, 10.1650/CONDOR-14-54.1, 116, 4, (560-573), (2014).
    • , Fuzzy Boundaries: Color and Gene Flow Patterns among Parapatric Lineages of the Western Shovel-Nosed Snake and Taxonomic Implication, PLoS ONE, 9, 5, (e97494), (2014).
    • , Measuring connectivity of invasive stoat populations to inform conservation management, Wildlife Research, 41, 5, (395), (2014).
    • , Advantages and Challenges of Genetic Stock Identification in Fish Stocks with Low Genetic Resolution, Transactions of the American Fisheries Society, 143, 2, (479-488), (2014).
    • , Geographic Variation of Melanisation Patterns in a Hornet Species: Genetic Differences, Climatic Pressures or Aposematic Constraints?, PLoS ONE, 9, 4, (e94162), (2014).
    • , Landscape variability explains spatial pattern of population structure of northern pike (sox lucius) in a large fluvial system, Ecology and Evolution, 4, 19, (3723-3735), (2014).
    • , Linking tagging technology and molecular genetics to gain insight in the spatial dynamics of two stocks of cod in Northeast Atlantic waters, ICES Journal of Marine Science, 71, 6, (1417), (2014).
    • , Molecular Tools for Sustainable Management of Aquatic Germplasm Resources of India, Agricultural Research, 3, 1, (1), (2014).
    • , Life history of turbot in Icelandic waters: Intra- and inter-population genetic diversity and otolith tracking of environmental temperatures, Fisheries Research, 155, (185), (2014).
    • , Temporal and Spatial Scaling of the Genetic Structure of a Vector-Borne Plant Pathogen, Phytopathology, 104, 2, (120), (2014).
    • , Population structure and intergeneric hybridization in harbour porpoises Phocoena phocoena in British Columbia, Canada, Endangered Species Research, 26, 1, (1), (2014).
    • , Levels of social behaviors and genetic structure in a population of round-tailed ground squirrels (Xerospermophilus tereticaudus), Behavioral Ecology and Sociobiology, 68, 4, (629), (2014).
    • , Speciation slowing down in widespread and long-living tree taxa: insights from the tropical timber tree genus Milicia (Moraceae), Heredity, 113, 1, (74), (2014).
    • , From species divergence to population structure: A multimarker approach on the most basal lineage of Salamandridae, the spectacled salamanders (genus Salamandrina) from Italy, Molecular Phylogenetics and Evolution, 70, (1), (2014).
    • , Fractured Genetic Connectivity Threatens a Southern California Puma (Puma concolor) Population, PLoS ONE, 9, 10, (e107985), (2014).
    • , Genetic analyses of two spawning stocks of the short-finned squid (Illex argentinus) using nuclear and mitochondrial data, Comptes Rendus Biologies, 337, 9, (503), (2014).
    • , Mitogenomics of the Speartooth Shark challenges ten years of control region sequencing, BMC Evolutionary Biology, 14, 1, (2014).
    • , Demographic history, marker variability and genetic differentiation in sandy beach fauna: What is the meaning of low FST's?, Estuarine, Coastal and Shelf Science, 150, (120), (2014).
    • , Genetic and morphometric diversity in the Lark Sparrow (Chondestes grammacus) suggest discontinuous clinal variation across major breeding regions associated with previously characterized subspecies, The Auk, 131, 3, (298), (2014).
    • , Quasi equilibrium, variance effective size and fixation index for populations with substructure, Journal of Mathematical Biology, 69, 5, (1057), (2014).
    • , Genetic structure and gene flow in Beta vulgaris subspecies maritima along the Atlantic coast of France, Genetic Resources and Crop Evolution, 61, 3, (651), (2014).
    • , Simulation and empirical analysis of novel sibship-based genetic determination of fish passage, Canadian Journal of Fisheries and Aquatic Sciences, 71, 11, (1667), (2014).
    • , Differing lifestyles of Staphylococcus epidermidis as revealed through Bayesian clustering of multilocus sequence types, Infection, Genetics and Evolution, 22, (257), (2014).
    • , Delineation of conservation units in an endangered marsupial, the southern brown bandicoot (Isoodon obesulus obesulus), in South Australia/western Victoria, Australia, Australian Journal of Zoology, 62, 5, (345), (2014).
    • , Speciation in Fungal and Oomycete Plant Pathogens, Annual Review of Phytopathology, 10.1146/annurev-phyto-102313-050056, 52, 1, (289-316), (2014).
    • , Comparative population genetics and evolutionary history of two commonly misidentified billfishes of management and conservation concern, BMC Genetics, 15, 1, (2014).
    • , Out of the Celtic cradle: The genetic signature of European hake connectivity in South-western Europe, Journal of Sea Research, 93, (90), (2014).
    • , Ocean-scale connectivity and life cycle reconstruction in a deep-sea fish, Canadian Journal of Fisheries and Aquatic Sciences, 10.1139/cjfas-2013-0343, 71, 9, (1312-1323), (2014).
    • , Phylogeographic Analyses of Submesophotic Snappers Etelis coruscans and Etelis “marshi” (Family Lutjanidae) Reveal Concordant Genetic Structure across the Hawaiian Archipelago, PLoS ONE, 9, 4, (e91665), (2014).
    • , Speciation in Western Scrub-Jays, Haldane’s rule, and genetic clines in secondary contact, BMC Evolutionary Biology, 14, 1, (135), (2014).
    • , Cytonuclear discordance and historical demography of two brown frogs, Rana tagoi and R. sakuraii (Amphibia: Ranidae), Molecular Phylogenetics and Evolution, 79, (231), (2014).
    • , Genetic structure among spawning aggregations of the gulf coney Hyporthodus acanthistius, Marine Ecology Progress Series, 10.3354/meps10637, 499, (193-201), (2014).
    • , Nicholas Wade and Race: Building a Scientific Façade, Human Biology, 86, 3, (227), (2014).
    • , Water availability strongly impacts population genetic patterns of an imperiled Great Plains endemic fish, Conservation Genetics, 15, 4, (771), (2014).
    • , Structure and Genetic Diversity of Natural Populations of Morus alba in the Trans-Himalayan Ladakh Region, Biochemical Genetics, 52, 3-4, (137), (2014).
    • , Genetic Composition of the Warm Springs River Chinook Salmon Population Maintained following Eight Generations of Hatchery Production, Transactions of the American Fisheries Society, 143, 5, (1280-1294), (2014).
    • , Introgressive hybridization and latitudinal admixture clines in North Atlantic eels, BMC Evolutionary Biology, 14, 1, (61), (2014).
    • , Multiple management units of short-beaked common dolphins subject to fisheries bycatch off southern and southeastern Australia, Marine Ecology Progress Series, 10.3354/meps10649, 500, (265-279), (2014).
    • , Phylogeography of Red King Crab, King Crabs of the World, 10.1201/b16664-4, (47-72), (2014).
    • , The Genetic Integrity of the Ex Situ Population of the European Wildcat (Felis silvestris silvestris) Is Seriously Threatened by Introgression from Domestic Cats (Felis silvestris catus), PLoS ONE, 9, 8, (e106083), (2014).
    • , Is gene flow the most important evolutionary force in plants?, American Journal of Botany, 101, 5, (737-753), (2014).
    • , The interaction of environment and genetic diversity within meadows of the seagrass Posidonia australis (Posidoniaceae), Marine Ecology Progress Series, 506, (87), (2014).
    • , Population structure and conservation genetic assessment of the endangered Pugnose Shiner, Notropis anogenus, Conservation Genetics, 15, 2, (343), (2014).
    • , The Nuclear Genome, Stock Identification Methods, 10.1016/B978-0-12-397003-9.00014-X, (297-327), (2014).
    • , Demographic Connectivity for Ursid Populations at Wildlife Crossing Structures in Banff National Park, Conservation Biology, 27, 4, (721-730), (2013).
    • , Cytonuclear discordance among Southeast Asian black rats (Rattus rattus complex), Molecular Ecology, 22, 4, (1019-1034), (2012).
    • , Microevolution in time and space: SNP analysis of historical DNA reveals dynamic signatures of selection in Atlantic cod, Molecular Ecology, 22, 9, (2424-2440), (2013).
    • , Population genetics of the American eel (nguilla rostrata): ST = 0 and North Atlantic Oscillation effects on demographic fluctuations of a panmictic species, Molecular Ecology, 22, 7, (1763-1776), (2012).
    • , Using genetic techniques to quantify reinvasion, survival and in situ breeding rates during control operations, Molecular Ecology, 22, 20, (5071-5083), (2013).
    • , Spatiotemporal SNP analysis reveals pronounced biocomplexity at the northern range margin of Atlantic cod adus morhua, Evolutionary Applications, 6, 4, (690-705), (2013).
    • , Temporal patterns of genetic variation in a salmon population undergoing rapid change in migration timing, Evolutionary Applications, 6, 5, (795-807), (2013).
    • , Pleistocene expansion of the bipolar lichen etraria aculeata into the Southern hemisphere, Molecular Ecology, 22, 7, (1961-1983), (2013).
    • , Genetic diversity and differentiation in a wide ranging anadromous fish, American shad (losa sapidissima), is correlated with latitude, Molecular Ecology, 22, 6, (1558-1573), (2013).
    • , Conservation phylogeography: does historical diversity contribute to regional vulnerability in European tree frogs (yla arborea)?, Molecular Ecology, 22, 22, (5669-5684), (2013).
    • , Migration and dispersal patterns of bats and their influence on genetic structure, Mammal Review, 43, 3, (183-195), (2012).
    • , Population genetic structure among bobwhite in an agriculturally modified landscape, The Journal of Wildlife Management, 77, 7, (1472-1481), (2013).
    • , Relative accuracy of three common methods of parentage analysis in natural populations, Molecular Ecology, 22, 4, (1158-1170), (2012).
    • , Stream hierarchy defines riverscape genetics of a North American desert fish, Molecular Ecology, 22, 4, (956-971), (2012).
    • , Approximate Bayesian computation for modular inference problems with many parameters: the example of migration rates, Molecular Ecology, 22, 4, (987-1002), (2013).
    • , A genomic island linked to ecotype divergence in Atlantic cod, Molecular Ecology, 22, 10, (2653-2667), (2013).
    • , Distance, dams and drift: what structures populations of an endangered, benthic stream fish?, Freshwater Biology, 58, 10, (2050-2064), (2013).
    • , Multi‐scale effects of impoundments on genetic structure of creek chub (Semotilus atromaculatus) in the Kansas River basin, Freshwater Biology, 58, 2, (441-453), (2012).
    • , Integrating multiple lines of evidence to better understand the evolutionary divergence of humpback dolphins along their entire distribution range: a new dolphin species in Australian waters?, Molecular Ecology, 22, 23, (5936-5948), (2013).
    • , Combined analyses of kinship and FST suggest potential drivers of chaotic genetic patchiness in high gene‐flow populations, Molecular Ecology, 22, 13, (3476-3494), (2013).
    • , Inferring recent historic abundance from current genetic diversity, Molecular Ecology, 22, 1, (22-40), (2012).
    • , Exploring Geovisualization Symbology for Landscape Genetics, Transactions in GIS, 17, 2, (267-281), (2012).
    • , Heterozygote deficiencies caused by a Wahlund effect: Dispelling unfounded expectations, The Journal of Wildlife Management, 77, 2, (226-234), (2012).
    • , Understanding the effectiveness of marine protected areas using genetic connectivity patterns and Lagrangian simulations, Diversity and Distributions, 19, 12, (1531-1542), (2013).
    • , Single nucleotide polymorphism discovery in albacore and Atlantic bluefin tuna provides insights into worldwide population structure, Animal Genetics, 44, 6, (678-692), (2013).
    • , Limited contemporary gene flow and high self‐replenishment drives peripheral isolation in an endemic coral reef fish, Ecology and Evolution, 3, 6, (1653-1666), (2013).
    • , Large‐scale population genetic structure in Bonelli's Eagle quila fasciata, Ibis, 155, 3, (485-498), (2013).
    • , EVOLUTIONARY INFERENCES FROM THE ANALYSIS OF EXCHANGEABILITY, Evolution, 67, 12, (3429-3441), (2013).
    • , Origin and demographic history of the endemic Taiwan spruce (Picea morrisonicola), Ecology and Evolution, 3, 10, (3320-3333), (2013).
    • , Long‐term panmixia in a cosmopolitan Indo‐Pacific coral reef fish and a nebulous genetic boundary with its broadly sympatric sister species, Journal of Evolutionary Biology, 26, 4, (783-799), (2013).
    • , Male-biased Dispersal Causes Intersexual Differences in the Subpopulation Structure of the Gray-sided Vole, Journal of Heredity, 104, 5, (718), (2013).
    • , No evidence of host specialization in a parasitic pea-crab exploiting two echinoid hosts, Marine Ecology Progress Series, 475, (167), (2013).
    • , SNP Discovery in European Anchovy (Engraulis encrasicolus, L) by High-Throughput Transcriptome and Genome Sequencing, PLoS ONE, 8, 8, (e70051), (2013).
    • , Green turtle population structure in the Pacific: new insights from single nucleotide polymorphisms and microsatellites, Endangered Species Research, 20, 3, (227), (2013).
    • , Strong maternal fidelity and natal philopatry shape genetic structure in North Pacific humpback whales, Marine Ecology Progress Series, 494, (291), (2013).
    • , Landscape Genetics, Encyclopedia of Biodiversity, 10.1016/B978-0-12-384719-5.00386-5, (508-523), (2013).
    • , Habitat fragmentation in forests affects relatedness and spatial genetic structure of a native rodent, attus lutreolus, Austral Ecology, 38, 5, (568-580), (2013).
    • , Low Connectivity between Mediterranean Marine Protected Areas: A Biophysical Modeling Approach for the Dusky Grouper Epinephelus marginatus, PLoS ONE, 8, 7, (e68564), (2013).
    • , Gene Flow between Sympatric Life History Forms of Oncorhynchus mykiss Located above and below Migratory Barriers, PLoS ONE, 8, 11, (e79931), (2013).
    • , Crinkles in connectivity: combining genetics and other types of biological data to estimate movement and interbreeding between populations, Marine and Freshwater Research, 10.1071/MF12314, 64, 3, (201), (2013).
    • , Subtle Population Genetic Structure in Yelloweye Rockfish (Sebastes ruberrimus) Is Consistent with a Major Oceanographic Division in British Columbia, Canada, PLoS ONE, 8, 8, (e71083), (2013).
    • , Using new analytical approaches to verify the origin of fish, New Analytical Approaches for Verifying the Origin of Food, 10.1533/9780857097590.3.189, (189-215), (2013).
    • , Introduced populations as genetic reservoirs for imperiled species: a case study of the Arkansas River Shiner (Notropis girardi), Conservation Genetics, 14, 3, (637), (2013).
    • , Single population and common natal origin for Adriatic Scomber scombrus stocks: evidence from an integrated approach, ICES Journal of Marine Science, 70, 2, (387), (2013).
    • , Genetic Structure, Diversity and Subspecies Status of Gull-billed Terns (Gelochelidon nilotica) from the United States, Waterbirds, 36, 3, (310), (2013).
    • , Monitoring reveals two genetically distinct brown trout populations remaining in stable sympatry over 20 years in tiny mountain lakes, Conservation Genetics, 14, 4, (795), (2013).
    • , Pathogen typing in the genomics era: MLST and the future of molecular epidemiology, Infection, Genetics and Evolution, 16, (38), (2013).
    • , Inferring contemporary dispersal processes in plant metapopulations: comparison of direct and indirect estimates of dispersal for the annual species Crepis sancta, Heredity, 111, 1, (1), (2013).
    • , Evaluating ex situ conservation projects: Genetic structure of the captive population of the Arabian sand cat, Mammalian Biology, 10.1016/j.mambio.2013.03.001, 78, 5, (379-382), (2013).
    • , Efficacy of population structure analysis with breeding populations and inbred lines, Genetica, 141, 7-9, (389), (2013).
    • , Identifying genetic signatures of selection in a non-model species, alpine gentian (Gentiana nivalis L.), using a landscape genetic approach, Conservation Genetics, 14, 2, (467), (2013).
    • , Indirect Estimates of Natal Dispersal Distance from Genetic Data in a Stream-Dwelling Fish (Mogurnda adspersa), Journal of Heredity, 104, 6, (779), (2013).
    • , Searching for a stock structure in Sardina pilchardus from the Adriatic and Ionian seas using a microsatellite DNA-based approach, Scientia Marina, 77, 4, (565), (2013).
    • , A High Throughput Genotyping Approach Reveals Distinctive Autosomal Genetic Signatures for European and Near Eastern Wild Boar, PLoS ONE, 8, 2, (e55891), (2013).
    • , Ancient DNA for the Archaeologist: The Future of African Research, African Archaeological Review, 30, 1, (21), (2013).
    • , Observations of Migrant Exchange and Mixing in a Coral Reef Fish Metapopulation Link Scales of Marine Population Connectivity, Journal of Heredity, 10.1093/jhered/est021, 104, 4, (532-546), (2013).
    • , Phenotypic and Genetic Divergence among Poison Frog Populations in a Mimetic Radiation, PLoS ONE, 8, 2, (e55443), (2013).
    • , The interplay between dispersal and gene flow in anadromous Arctic char (Salvelinus alpinus): implications for potential for local adaptation, Canadian Journal of Fisheries and Aquatic Sciences, 70, 9, (1327), (2013).
    • , Population stock structure of leatherback turtles (Dermochelys coriacea) in the Atlantic revealed using mtDNA and microsatellite markers, Conservation Genetics, 14, 3, (625), (2013).
    • , Separation of the largest eigenvalues in eigenanalysis of genotype data from discrete subpopulations, Theoretical Population Biology, 89, (34), (2013).
    • , European Invasion of North American Pinus strobus at Large and Fine Scales: High Genetic Diversity and Fine-Scale Genetic Clustering over Time in the Adventive Range, PLoS ONE, 8, 7, (e68514), (2013).
    • , Population connectivity: recent advances and new perspectives, Landscape Ecology, 10.1007/s10980-012-9819-z, 28, 2, (165-185), (2012).
    • , Assessing the distinctiveness of the Cultus pygmy sculpin, a threatened endemic, from the widespread coastrange sculpin Cottus aleuticus , Endangered Species Research, 20, 2, (181), (2013).
    • , Fine scale spatial genetic structure of two syntopic newts across a network of ponds: implications for conservation, Conservation Genetics, 14, 2, (385), (2013).
    • , Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance, Biological Invasions, 15, 8, (1847), (2013).
    • , Microsatellite Analyses of Blacktip Reef Sharks (Carcharhinus melanopterus) in a Fragmented Environment Show Structured Clusters, PLoS ONE, 8, 4, (e61067), (2013).
    • , Identifying eradication units in an invasive mammalian pest species, Biological Invasions, (2013).
    • , (Flat)fish stocks in an ecosystem and evolutionary perspective, Journal of Sea Research, 10.1016/j.seares.2012.06.011, 75, (19-32), (2013).
    • , Population Genetics of Daubenton's Bat ( Myotis daubentonii ) in the Archipelago Sea, SW Finland , Annales Zoologici Fennici, 10.5735/085.050.0505, 50, 5, (303-315), (2013).
    • , Conservation Genetics, Encyclopedia of Biodiversity, 10.1016/B978-0-12-384719-5.00267-7, (263-277), (2013).
    • , High genetic connectivity and introgression from domestic reindeer characterize northern Alaska caribou herds, Conservation Genetics, 14, 6, (1111), (2013).
    • , Interplay between isolation by distance and genetic clusters in the red coral Corallium rubrum: insights from simulated and empirical data, Conservation Genetics, 14, 3, (705), (2013).
    • , A role for both ecology and geography as mechanisms of genetic differentiation in specialized butterflies, Evolutionary Ecology, 27, 3, (565), (2013).
    • , Timing of Population Fragmentation in a Vulnerable Minnow, the Umpqua Chub, and the Role of Nonnative Predators, Transactions of the American Fisheries Society, 142, 2, (447-457), (2013).
    • , Spatial and temporal microsatellite variation in spawning Atlantic cod, Gadus morhua, around Iceland, Canadian Journal of Fisheries and Aquatic Sciences, 70, 8, (1151), (2013).
    • , Genetic structure and patterns of gene flow among populations of the endangered Ethiopian wolf, Animal Conservation, 16, 2, (234), (2013).
    • , Genetic Structure ofNotholithocarpus densiflorus(Fagaceae) from the Species to the Local Scale: A Review of Our Knowledge for Conservation and Replanting, Madroño, 60, 2, (130), (2013).
    • , The effect of close relatives on unsupervised Bayesian clustering algorithms in population genetic structure analysis, Molecular Ecology Resources, 12, 5, (873-884), (2012).
    • , Open and closed seascapes: Where does habitat patchiness create populations with high fractions of self‐recruitment?, Ecological Applications, 22, 4, (1257-1267), (2012).
    • , The interplay of dispersal limitation, rivers, and historical events shapes the genetic structure of an Amazonian frog, Biological Journal of the Linnean Society, 106, 2, (356-373), (2012).
    • , A landscape genetics approach reveals ecological‐based differentiation in populations of holm oak (Quercus ilex L.) at the northern limit of its range, Biological Journal of the Linnean Society, 107, 2, (458-467), (2012).
    • , Urban landscape genetics: canopy cover predicts gene flow between white‐footed mouse (Peromyscus leucopus) populations in New York City, Molecular Ecology, 21, 6, (1360-1378), (2012).
    • , Vicariance divergence and gene flow among islet populations of an endemic lizard, Molecular Ecology, 21, 1, (117-129), (2011).
    • , Common misconceptions in molecular ecology: echoes of the modern synthesis, Molecular Ecology, 21, 17, (4171-4189), (2012).
    • , Population structure of island‐associated dolphins: Evidence from mitochondrial and microsatellite markers for common bottlenose dolphins (Tursiops truncatus) around the main Hawaiian Islands, Marine Mammal Science, 28, 3, (E208-E232), (2011).
    • , Disentangling the genetic origins of a plant pathogen during disease spread using an original molecular epidemiology approach, Molecular Ecology, 21, 10, (2383-2398), (2012).
    • , Spatial genetic structure of the mountain pine beetle (Dendroctonus ponderosae) outbreak in western Canada: historical patterns and contemporary dispersal, Molecular Ecology, 21, 12, (2931-2948), (2012).
    • , Inferring dispersal patterns of the generalist root fungus Armillaria mellea, New Phytologist, 193, 4, (959-969), (2011).
    • , Population genetic structure and gene flow patterns between populations of the Antarctic icefish Chionodraco rastrospinosus, Journal of Biogeography, 39, 7, (1361-1372), (2012).
    • , Molecular tools and analytical approaches for the characterization of farm animal genetic diversity, Animal Genetics, 43, 5, (483-502), (2012).
    • , The prevailing paradigm as a hindrance to conservation, Wildlife Society Bulletin, 36, 3, (408-414), (2012).
    • , SNP diversity in introduced populations of the invasive Gambusia holbrooki, Ecology of Freshwater Fish, 21, 1, (100-108), (2011).
    • , Islands and streams: clusters and gene flow in wild barley populations from the Levant, Molecular Ecology, 21, 5, (1115-1129), (2012).
    • , Defining evolutionary boundaries across parapatric ecomorphs of Black Salamanders (neides flavipunctatus) with conservation implications, Molecular Ecology, 21, 23, (5745-5761), (2012).
    • , Connectivity of local amphibian populations: modelling the migratory capacity of radio‐tracked natterjack toads, Animal Conservation, 15, 4, (388-396), (2012).
    • , Beyond the Venn diagram: the hunt for a core microbiome, Environmental Microbiology, 14, 1, (4-12), (2011).
    • , Identification of subpopulations from connectivity matrices, Ecography, 35, 11, (1004-1016), (2012).
    • , Detecting immigrants in a highly genetically homogeneous spiny lobster population (alinurus elephas) in the northwest Mediterranean Sea, Ecology and Evolution, 2, 10, (2387-2396), (2012).
    • , Subtle genetic structure reveals restricted connectivity among populations of a coral reef fish inhabiting remote atolls, Ecology and Evolution, 2, 3, (666-679), (2012).
    • , Role of recent and old riverine barriers in fine‐scale population genetic structure of Geoffroy's tamarin (Saguinus geoffroyi) in the Panama Canal watershed, Ecology and Evolution, 2, 2, (298-309), (2011).
    • , Metagenomic epidemiology: a public health need for the control of antimicrobial resistance, Clinical Microbiology and Infection, 18, (67-73), (2012).
    • , The role of genetic structure in the adaptive divergence of populations experiencing saltwater intrusion due to relative sea‐level rise, Journal of Evolutionary Biology, 25, 12, (2623-2632), (2012).
    • , Population structure and genetic differentiation among the USDA common bean (Phaseolus vulgaris L.) core collection, Genetic Resources and Crop Evolution, 59, 4, (499), (2012).
    • , The evolution of a highly speciose group in a changing environment: are we witnessing speciation in the Iberá wetlands?, Molecular Ecology, 21, 13, (3266-3282), (2012).
    • , Molecular markers: progress and prospects for understanding reproductive ecology in elasmobranchs, Journal of Fish Biology, 80, 5, (1120-1140), (2012).
    • , Genetically Derived Estimates of Contemporary Natural Straying Rates and Historical Gene Flow among Lake Michigan Lake Sturgeon Populations, Transactions of the American Fisheries Society, 141, 5, (1374-1388), (2012).
    • , Settling-depth vs. genotype and size vs. genotype correlations at the Pan I locus in 0-group Atlantic cod Gadus morhua , Marine Ecology Progress Series, 468, (267), (2012).
    • , Population structure and genetic diversity of Rana dalmatina in the Iberian Peninsula, Conservation Genetics, 13, 1, (197), (2012).
    • , Incorporating deep and shallow components of genetic structure into the management of Alaskan red king crab, Evolutionary Applications, 5, 8, (820-837), (2012).
    • , Population divergence and gene flow in an endangered and highly mobile seabird, Heredity, 109, 1, (19), (2012).
    • , Evidence of stable genetic structure across a remote island archipelago through self‐recruitment in a widely dispersed coral reef fish, Ecology and Evolution, 2, 12, (3195-3213), (2012).
    • , The role of the Ord Arid Intrusion in the historical and contemporary genetic division of long‐tailed finch subspecies in northern Australia, Ecology and Evolution, 2, 6, (1208-1219), (2012).
    • , Movement of adult temperate reef fishes off the west coast of North America, Canadian Journal of Fisheries and Aquatic Sciences, 69, 8, (1362), (2012).
    • , Comparison of Radiotelemetry and Microsatellites for Determining the Origin of Yukon River Chinook Salmon, North American Journal of Fisheries Management, 32, 4, (720-730), (2012).
    • , Analyses of Genetic Variation in Populations of Oregon Chub, a Threatened Floodplain Minnow in a Highly Altered Environment, Transactions of the American Fisheries Society, 141, 2, (533-549), (2012).
    • , Population Structure and Evolutionary History of Southern Flounder in the Gulf of Mexico and Western Atlantic Ocean, Transactions of the American Fisheries Society, 141, 1, (46-55), (2012).
    • , Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow(Ammodramus caudacutus), The Auk, 129, 2, (247), (2012).
    • , Genetic population structure and connectivity in a commercially exploited and wide-ranging deepwater shark, the leafscale gulper (Centrophorus squamosus), Marine and Freshwater Research, 63, 6, (505), (2012).
    • , Temporal genetic variation as revealed by a microsatellite analysis of European sardine (Sardina pilchardus) archived samples, Canadian Journal of Fisheries and Aquatic Sciences, 69, 10, (1698), (2012).
    • , Harnessing genomics for delineating conservation units, Trends in Ecology & Evolution, 27, 9, (489), (2012).
    • , AMOVA-Based Clustering of Population Genetic Data, Journal of Heredity, 103, 5, (744), (2012).
    • , Alosine Restoration in the 21st Century: Challenging the Status Quo, Marine and Coastal Fisheries, 4, 1, (174-187), (2012).
    • , How does the 50/500 rule apply to MVPs?, Trends in Ecology & Evolution, 27, 10, (578), (2012).
    • , Reconstruction of caribou evolutionary history in Western North America and its implications for conservation, Molecular Ecology, 21, 14, (3610-3624), (2012).
    • , Fine-scale spatial genetic structure in the brooding sea urchin Abatus cordatus suggests vulnerability of the Southern Ocean marine invertebrates facing global change, Polar Biology, 35, 4, (611), (2012).
    • , Regional mtDNA SNP differentiation in European Atlantic salmon (Salmo salar): an assessment of potential utility for determination of natal origin, ICES Journal of Marine Science, 69, 9, (1625), (2012).
    • , Genetic Pedigree Reconstruction Facilitates Lakewide Estimates of Age‐0 Largemouth Bass Dispersal, Transactions of the American Fisheries Society, 141, 6, (1672-1681), (2012).
    • , Genetic structure of the arboreal squirrels (Glaucomys sabrinus and Tamiasciurus hudsonicus) in the North American Black Hills, Canadian Journal of Zoology, 90, 9, (1191), (2012).
    • , Paleolithic Contingent in Modern Japanese: Estimation and Inference using Genome-wide Data, Scientific Reports, 2, 1, (2012).
    • , Fine-scale genetic population structure of an understory rainforest bird in Costa Rica, Conservation Genetics, 13, 4, (925), (2012).
    • , Genetic Connectivity among and Self-Replenishment within Island Populations of a Restricted Range Subtropical Reef Fish, PLoS ONE, 7, 11, (e49660), (2012).
    • , Population Genetic Structure and Colonisation History of the Tool-Using New Caledonian Crow, PLoS ONE, 7, 5, (e36608), (2012).
    • , Allele frequency stability in large, wild exploited populations over multiple generations: insights from Alaska sockeye salmon (Oncorhynchus nerka), Canadian Journal of Fisheries and Aquatic Sciences, 69, 5, (916), (2012).
    • , Examining an Outlier: Molecular Diversity in the Cirripedia, Integrative and Comparative Biology, 52, 3, (410), (2012).
    • , High‐throughput microsatellite marker development in two sparid species and verification of their transferability in the family Sparidae, Molecular Ecology Resources, 12, 4, (740-752), (2012).
    • , Genetic Estimates of Population Age in the Water Flea, Daphnia magna, Journal of Heredity, 103, 6, (887), (2012).
    • , Urban Habitat Fragmentation and Genetic Population Structure of Bobcats in Coastal Southern California, The American Midland Naturalist, 168, 2, (265), (2012).
    • , Landscape Genetics Reveals Population Subdivision in Bering Sea and Aleutian Islands Pacific Cod, Transactions of the American Fisheries Society, 141, 6, (1557-1573), (2012).
    • , Genetic characterization of the Neotropical catfish Pimelodus maculatus (Pimelodidae, Siluriformes) in the Upper Uruguay River, Genetics and Molecular Biology, 35, 4, (761), (2012).
    • , Capacity for increase, compensatory reserves, and catastrophes as determinants of minimum viable population in freshwater fishes, Ecological Modelling, 247, (319), (2012).
    • , Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish, Oecologia, 168, 1, (61), (2012).
    • , A Unifying Model for the Analysis of Phenotypic, Genetic, and Geographic Data, Systematic Biology, 61, 6, (897), (2012).
    • , Population Structure and Run Timing of Steelhead in the Skeena River, British Columbia, North American Journal of Fisheries Management, 32, 2, (262-275), (2012).
    • , Molecular Markers Reveal Infestation Dynamics of the Bed Bug (Hemiptera: Cimicidae) Within Apartment Buildings, Journal of Medical Entomology, 49, 3, (535), (2012).
    • , Searching for common threads in threadfins: phylogeography of Australian polynemids in space and time, Marine Ecology Progress Series, 449, (263), (2012).
    • , Population genetic structure in a deepwater fish Coryphaenoides rupestris: patterns and processes, Marine Ecology Progress Series, 460, (233), (2012).
    • , Retrospective coalescent methods and the reconstruction of metapopulation histories in the sea, Evolutionary Ecology, 26, 2, (291), (2012).
    • , Empirical comparison of single nucleotide polymorphisms and microsatellites for population and demographic analyses of bowhead whales, Endangered Species Research, 19, 2, (129), (2012).
    • , Spatiotemporal segregation among summer stocks of beluga (Delphinapterus leucas) despite nuclear gene flow: implication for the endangered belugas in eastern Hudson Bay (Canada), Conservation Genetics, 13, 2, (419), (2012).
    • , A hunted population in recovery: Effective population size for South American sea lions from Patagonia, Animal Biology, 62, 4, (433), (2012).
    • , Parsimony-based pedigree analysis and individual-based landscape genetics suggest topography to restrict dispersal and connectivity in the endangered capercaillie, Biological Conservation, 152, (241), (2012).
    • , FLOCK Provides Reliable Solutions to the “Number of Populations” Problem, Journal of Heredity, 103, 5, (734), (2012).
    • , Estimating population boundaries using regional and local-scale spatial genetic structure: an example in Eucalyptus globulus, Tree Genetics & Genomes, 8, 4, (695), (2012).
    • , Distance‐based population classification software using mean‐field annealing, Molecular Ecology Resources, 11, 1, (116-125), (2010).
    • , An integrated genetic‐demographic model to unravel the origin of genetic structure in European eel (Anguilla anguilla L.), Evolutionary Applications, 4, 4, (517-533), (2010).
    • , Genetic differentiation of three endangered wild roses in northeastern Germany: Rosa inodora Fries, Rosa sherardii Davies and Rosa subcollina (H. Christ) Keller, Plant Biology, 13, 3, (524-533), (2010).
    • , Fine‐scale population structure and riverscape genetics of brook trout (Salvelinus fontinalis) distributed continuously along headwater channel networks, Molecular Ecology, 20, 18, (3711-3729), (2011).
    • , Individual‐based analysis opens new insights into understanding population structure and animal behaviour, Molecular Ecology, 20, 2, (187-189), (2011).
    • , Range‐Wide Genetic Connectivity of the Hawaiian Monk Seal and Implications for Translocation, Conservation Biology, 25, 1, (124-132), (2010).
    • , Are low but statistically significant levels of genetic differentiation in marine fishes ‘biologically meaningful’? A case study of coastal Atlantic cod, Molecular Ecology, 20, 4, (768-783), (2010).
    • , Inferring the origin of populations introduced from a genetically structured native range by approximate Bayesian computation: case study of the invasive ladybird Harmonia axyridis, Molecular Ecology, 20, 22, (4654-4670), (2011).
    • , From global to local genetic structuring in the red gorgonian Paramuricea clavata: the interplay between oceanographic conditions and limited larval dispersal, Molecular Ecology, 20, 16, (3291-3305), (2011).
    • , Population genetic structure of Atlantic salmon, Salmo salar L., in the River Tamar, southwest England, Fisheries Management and Ecology, 18, 3, (233-245), (2010).
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    • , Sperm whale population structure in the eastern and central North Pacific inferred by the use of single‐nucleotide polymorphisms, microsatellites and mitochondrial DNA, Molecular Ecology Resources, 11, s1, (278-298), (2011).
    • , Temporal genetic stability and high effective population size despite fisheries‐induced life‐history trait evolution in the North Sea sole, Molecular Ecology, 20, 17, (3555-3568), (2011).
    • , High gene flow and metapopulation dynamics detected for three species in a dryland river system, Freshwater Biology, 56, 11, (2378-2390), (2011).
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    • , A review of ecological models for brown trout: towards a new demogenetic model, Ecology of Freshwater Fish, 20, 2, (167-198), (2011).
    • , Glacial survival may matter after all: nunatak signatures in the rare European populations of two west‐arctic species, Molecular Ecology, 20, 2, (376-393), (2010).
    • , Multilevel population genetics in antibiotic resistance, FEMS Microbiology Reviews, 35, 5, (705-706), (2011).
    • , CORRELATIONS BETWEEN HETEROZYGOSITY AND REPRODUCTIVE SUCCESS IN THE BLUE TIT (CYANISTES CAERULEUS): AN ANALYSIS OF INBREEDING AND SINGLE LOCUS EFFECTS, Evolution, 65, 11, (3175-3194), (2011).
    • , MULTISCALE GENETIC STRUCTURE OF AN ENDANGERED SEAWEED AHNFELTIOPSIS PUSILLA (RHODOPHYTA): IMPLICATIONS FOR ITS CONSERVATION, Journal of Phycology, 47, 2, (259-268), (2011).
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    • , PROGRESS TOWARD A GENERAL SPECIES CONCEPT, Evolution, 65, 4, (923-931), (2011).
    • , Population genetic structure of Anopheles arabiensis and Anopheles gambiae in a malaria endemic region of southern Tanzania, Malaria Journal, 10.1186/1475-2875-10-289, 10, 1, (289), (2011).
    • , Population connectivity: dam migration mitigations and contemporary site fidelity in arctic char, BMC Evolutionary Biology, 11, 1, (2011).
    • , Genetic mixed-stock analysis of Atlantic herring populations in a mixed feeding area, Marine Ecology Progress Series, 442, (187), (2011).
    • , Challenges to assessing connectivity between massive populations of the Australian plague locust, Proceedings of the Royal Society B: Biological Sciences, 278, 1721, (3152), (2011).
    • , Comparative Genetics of Sarcoid Tumour-Affected and Non-Affected Mountain Zebra (Equus zebra) Populations, South African Journal of Wildlife Research, 41, 1, (36), (2011).
    • , Insights from Population Genetics: Are all Crustaceans Created Equal?, Journal of Crustacean Biology, 31, 2, (339), (2011).
    • , Darwinism without populations: a more inclusive understanding of the “Survival of the Fittest”, Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, 42, 1, (106), (2011).
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    • , Will an “Island” population of voles be recolonized if eradicated? insights from Molecular genetic analyses, The Journal of Wildlife Management, 75, 8, (1812-1818), (2011).
    • , Population delimitation across contrasting evolutionary clines in deer mice (Peromyscus maniculatus), Ecology and Evolution, 1, 1, (26-36), (2011).
    • , Micro-spatial genetic structure in song sparrows (Melospiza melodia), Conservation Genetics, 12, 1, (213), (2011).
    • , Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba, BMC Genetics, 10.1186/1471-2156-12-32, 12, 1, (32), (2011).
    • , A GIS-Based Tool for Representing Larval Dispersal for Marine Reserve Selection, The Professional Geographer, 63, 4, (489), (2011).
    • , An empirical assessment of individual-based population genetic statistical techniques: application to British pig breeds, Heredity, 106, 2, (261), (2011).
    • , A steep genetic cline in yellowtail rockfish, Sebastes flavidus, suggests regional isolation across the Cape Mendocino faunal break, Canadian Journal of Fisheries and Aquatic Sciences, 68, 1, (89), (2011).
    • , Persistent Reproductive Isolation between Sympatric Lineages of Fall Chinook Salmon in White Salmon River, Washington, Transactions of the American Fisheries Society, 140, 3, (699-715), (2011).
    • , Facts and uncertainties about the genetic population structure of Atlantic bluefin tuna (Thunnus thynnus) in the Mediterranean. Implications for fishery management, Reviews in Fish Biology and Fisheries, 21, 3, (527), (2011).
    • , Trans-Atlantic genetic uniformity in the rare snowbed sedge Carex rufina, Conservation Genetics, 12, 5, (1367), (2011).
    • , Population Genetic Structure in German Cockroaches (Blattella Germanica): Differentiated Islands in an Agricultural Landscape, Journal of Heredity, 102, 2, (175), (2011).
    • , Analyzing intraspecific genetic variation, Phylogeography and Population Genetics in Crustacea, 10.1201/b11113-3, (3-30), (2012).
    • , What can gene flow and recruitment dynamics tell us about connectivity between European hake stocks in the Eastern North Atlantic?, Continental Shelf Research, 31, 5, (376), (2011).
    • , Genetic patchiness in European eel adults evidenced by molecular genetics and population dynamics modelling, Molecular Phylogenetics and Evolution, 58, 2, (198), (2011).
    • , Estimating connectivity in marine fish populations, Oceanography and Marine Biology, 10.1201/b11009-6, (2011).
    • , Levels of dispersal and tail loss in an Australian gecko (Gehyra variegata) are associated with differences in forest structure, Australian Journal of Zoology, 59, 3, (170), (2011).
    • , Genetic analysis reveals two stocks of skipjack tuna (Katsuwonus pelamis) in the northwestern Indian Ocean, Canadian Journal of Fisheries and Aquatic Sciences, 68, 2, (210), (2011).
    • , Connectivity dominates larval replenishment in a coastal reef fish metapopulation, Proceedings of the Royal Society B: Biological Sciences, 278, 1720, (2954), (2011).
    • , Connectivity of Estuaries, Treatise on Estuarine and Coastal Science, 10.1016/B978-0-12-374711-2.00709-9, (119-142), (2011).
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    • , Living Together but Remaining Apart: Atlantic and Mediterranean Loggerhead Sea Turtles (Caretta caretta) in Shared Feeding Grounds, Journal of Heredity, 102, 6, (666), (2011).
    • , Population connectivity among migratory and stationary cod Gadus morhua in the Northeast Atlantic—A review of 80 years of study, Marine Ecology Progress Series, 435, (269), (2011).
    • , Homogeneity at Nuclear Microsatellite Loci Masks Mitochondrial Haplotype Diversity in the Endangered Fanshell Pearlymussel (Cyprogenia stegaria), Journal of Heredity, 102, 2, (196), (2011).
    • , Genetic panmixia and demographic dependence across the North Atlantic in the deep-sea fish, blue hake (Antimora rostrata), Heredity, 106, 4, (690), (2011).
    • , Molecular ecology meets remote sensing: environmental drivers to population structure of humpback dolphins in the Western Indian Ocean, Heredity, 107, 4, (349), (2011).
    • , Genetic inferences about the population dynamics of codling moth females at a local scale, Genetica, 10.1007/s10709-011-9598-5, 139, 7, (949-960), (2011).
    • , Increased genetic differentiation in house sparrows after a strong population decline: From panmixia towards structure in a common bird, Biological Conservation, 144, 12, (2931), (2011).
    • , Towards modelling persistence of woodland birds: the role of genetics, Emu - Austral Ornithology, 111, 1, (19), (2011).
    • , Genetic population structure of Yellowtail Kingfish (Seriola lalandi) in temperate Australasian waters inferred from microsatellite markers and mitochondrial DNA, Aquaculture, 319, 3-4, (328), (2011).
    • , Inference of Population Structure and Patterns of Gene Flow in Canine Heartworm (Dirofilaria immitis), Journal of Parasitology, 97, 4, (602), (2011).
    • , Tracing fish and fish products from ocean to fork using advanced molecular technologies, Food Chain Integrity, 10.1533/9780857092519.3.259, (259-282), (2011).
    • , Hybridization between Yellowstone Cutthroat Trout and Rainbow Trout in the Upper Snake River Basin, Wyoming, North American Journal of Fisheries Management, 31, 6, (1077-1087), (2011).
    • , Combining demography and genetic analysis to assess the population structure of an amphibian in a human-dominated landscape, Conservation Genetics, 12, 1, (161), (2011).
    • , Genetic Population Structure of Olympic Peninsula Bull Trout Populations and Implications for Elwha Dam Removal, Northwest Science, 85, 3, (463), (2011).
    • , Genetic and morphological divergence in island and mainland birds: Informing conservation priorities, Biological Conservation, 144, 12, (2902), (2011).
    • , Geographic structure in Alaskan Pacific ocean perch (Sebastes alutus) indicates limited lifetime dispersal, Marine Biology, 158, 4, (779), (2011).
    • , Not All Larvae Stay Close to Home: Insights into Marine Population Connectivity with a Focus on the Brown Surgeonfish (Acanthurus nigrofuscus), Journal of Marine Biology, 2011, (1), (2011).
    • , Population genetics of introduced bullfrogs, Rana (Lithobates) catesbeianus, in the Willamette Valley, Oregon, USA, Biological Invasions, 13, 3, (651), (2011).
    • , Population Structure and Spatial Influence of Agricultural Variables on Hessian Fly Populations in the Southeastern United States, Environmental Entomology, 40, 5, (1303), (2011).
    • , Population genetic structure and conservation genetics of threatened Okaloosa darters (Etheostoma okaloosae), Conservation Genetics, 12, 4, (981), (2011).
    • , Reconciling stock assessment and management scales under conditions of spatially varying catch histories, Fisheries Research, 107, 1-3, (22), (2011).
    • , Effective population size is strongly correlated with breeding pond size in the endangered California tiger salamander, Ambystoma californiense, Conservation Genetics, 12, 4, (911), (2011).
    • , Demographic Processes Underlying Subtle Patterns of Population Structure in the Scalloped Hammerhead Shark, Sphyrna lewini, PLoS ONE, 6, 7, (e21459), (2011).
    • , Connectivity among populations of pygmy whitefish (Prosopium coulterii) in northwestern North America inferred from microsatellite DNA analyses, Canadian Journal of Zoology, 89, 4, (255), (2011).
    • , Microgeographical population structure and adaptation in Atlantic cod Gadus morhua: spatio-temporal insights from gene-associated DNA markers, Marine Ecology Progress Series, 436, (231), (2011).
    • , Birth of a hotspot of intraspecific genetic diversity: notes from the underground, Molecular Ecology, 19, 24, (5432-5451), (2010).
    • , Genetic survey of shallow populations of the Mediterranean red coral [Corallium rubrum (Linnaeus, 1758)]: new insights into evolutionary processes shaping nuclear diversity and implications for conservation, Molecular Ecology, 19, 4, (675-690), (2010).
    • , Considering spatial and temporal scale in landscape‐genetic studies of gene flow, Molecular Ecology, 19, 17, (3565-3575), (2010).
    • , Genetic diversity and connectivity of deep‐sea hydrothermal vent metapopulations, Molecular Ecology, 19, 20, (4391-4411), (2010).
    • , Isolation by environmental distance in mobile marine species: molecular ecology of franciscana dolphins at their southern range, Molecular Ecology, 19, 11, (2212-2228), (2010).
    • , Evidence from genetic and Lagrangian drifter data for transatlantic transport of small juvenile green turtles, Journal of Biogeography, 37, 9, (1752-1766), (2010).
    • , Utilizing disease surveillance to examine gene flow and dispersal in white‐tailed deer, Journal of Applied Ecology, 47, 6, (1189-1198), (2010).
    • , Spatially explicit Bayesian clustering models in population genetics, Molecular Ecology Resources, 10, 5, (773-784), (2010).
    • , Detecting populations in the ‘ambiguous’ zone: kinship‐based estimation of population structure at low genetic divergence, Molecular Ecology Resources, 10, 5, (797-805), (2010).
    • , Landscape effects on extremely fragmented populations of a rare solitary bee, Colletes floralis, Molecular Ecology, 19, 22, (4922-4935), (2010).
    • , Fine‐scale genetic structure and inferences on population biology in the threatened Mediterranean red coral, Corallium rubrum, Molecular Ecology, 19, 19, (4204-4216), (2010).
    • , Historical influences dominate the population genetic structure of a sedentary marine fish, Atlantic wolffish (Anarhichas lupus), across the North Atlantic Ocean, Molecular Ecology, 19, 19, (4228-4241), (2010).
    • , Rapid, pervasive genetic differentiation of urban white‐footed mouse (Peromyscus leucopus) populations in New York City, Molecular Ecology, 19, 19, (4242-4254), (2010).
    • , Estimating population structure from AFLP amplification intensity, Molecular Ecology, 19, 21, (4638-4647), (2010).
    • , The ‘Expansion–Contraction’ model of Pleistocene biogeography: rocky shores suffer a sea change?, Molecular Ecology, 19, 1, (146-169), (2009).
    • , Disentangling stocking introgression and natural migration in brown trout: survival success and recruitment failure in populations with semi‐supportive breeding, Freshwater Biology, 55, 12, (2626-2638), (2010).
    • , Shifting dispersal modes at an expanding species’ range margin, Molecular Ecology, 19, 6, (1134-1146), (2010).
    • , What can genetics tell us about population connectivity?, Molecular Ecology, 19, 15, (3038-3051), (2010).
    • , Landscape genetics of alpine Sierra Nevada salamanders reveal extreme population subdivision in space and time, Molecular Ecology, 19, 16, (3301-3314), (2010).
    • , Cryptic population genetic structure: the number of inferred clusters depends on sample size, Molecular Ecology Resources, 10, 2, (314-323), (2009).
    • , Variation in permissiveness for broad‐host‐range plasmids among genetically indistinguishable isolates of Dickeya sp. from a small field plot, FEMS Microbiology Ecology, 73, 1, (190-196), (2010).
    • , Pleistocene glaciations and contemporary genetic diversity in a Beringian fish, the broad whitefish, Coregonus nasus (Pallas): inferences from microsatellite DNA variation, Journal of Evolutionary Biology, 23, 1, (72-86), (2009).
    • , NUCLEAR AND MITOCHONDRIAL SEQUENCE DATA REVEAL AND CONCEAL DIFFERENT DEMOGRAPHIC HISTORIES AND POPULATION GENETIC PROCESSES IN CARIBBEAN REEF FISHES, Evolution, 64, 12, (3380-3397), (2010).
    • , USING ISOLATION BY DISTANCE AND EFFECTIVE DENSITY TO ESTIMATE DISPERSAL SCALES IN ANEMONEFISH, Evolution, 64, 9, (2688-2700), (2010).
    • , WHEN GAPS REALLY ARE GAPS: STATISTICAL PHYLOGEOGRAPHY OF HYDROTHERMAL VENT INVERTEBRATES, Evolution, 64, 8, (2369-2384), (2010).
    • , Range-wide genetic differentiation among North American great gray owls (Strix nebulosa) reveals a distinct lineage restricted to the Sierra Nevada, California, Molecular Phylogenetics and Evolution, 56, 1, (212), (2010).
    • , Population and species boundaries in the South American subterranean rodent Ctenomys in a dynamic environment, Biological Journal of the Linnean Society, 100, 2, (368-383), (2010).
    • , Genomics and the future of conservation genetics, Nature Reviews Genetics, 11, 10, (697), (2010).
    • , High level of population genetic structuring in lake‐run brown trout, Salmo trutta, of the Inari Basin, northern Finland, Journal of Fish Biology, 77, 9, (2048-2071), (2010).
    • , Comment on “Gene flow increases temporal stability of Chinook salmon (Oncorhynchus tshawytscha) populations in the Upper Fraser River, British Columbia, Canada”Appears in Can. J. Fish. Aquat. Sci. 66: 167–176., Canadian Journal of Fisheries and Aquatic Sciences, 67, 1, (202), (2010).
    • , Analysis of SSRs Uncovers Hierarchical Structure and Genetic Diversity in Chinese Soybean Landraces, Agricultural Sciences in China, 9, 12, (1739), (2010).
    • , Taking stock: defining populations of American shad (Alosa sapidissima) in Canada using neutral genetic markers, Canadian Journal of Fisheries and Aquatic Sciences, 67, 6, (1021), (2010).
    • , Inference of Population History by Coupling Exploratory and Model-Driven Phylogeographic Analyses, International Journal of Molecular Sciences, 11, 12, (1190), (2010).
    • , Population structure of lake trout (Salvelinus namaycush) in a large glacial-fed lake inferred from microsatellite DNA and morphological analysis, Canadian Journal of Fisheries and Aquatic Sciences, 10.1139/F10-054, 67, 7, (1171-1186), (2010).
    • , Genetic diversity analysis of black locust (Robinia pseudoacacia L.) distributed in China based on allozyme markers approach, Frontiers of Agriculture in China, 4, 3, (366), (2010).
    • , Shifting-balance stock structure in North Pacific walleye pollock (Gadus chalcogrammus), ICES Journal of Marine Science, 67, 8, (1687), (2010).
    • , Genetic analysis and characterization of a new maize association mapping panel for quantitative trait loci dissection, Theoretical and Applied Genetics, 121, 3, (417), (2010).
    • , A temporal perspective on population structure and gene flow in Atlantic salmon (Salmo salar) in Newfoundland, Canada, Canadian Journal of Fisheries and Aquatic Sciences, 67, 2, (225), (2010).
    • , Mapping genes that predict treatment outcome in admixed populations, The Pharmacogenomics Journal, 10.1038/tpj.2010.71, 10, 6, (465-477), (2010).
    • , Evidence of Panmixia between Sympatric Life History Forms of Coastal Cutthroat Trout in Two Lower Columbia River Tributaries, North American Journal of Fisheries Management, 30, 3, (691-701), (2011).
    • , Microsatellite variation and significant population genetic structure of endangered finless porpoises (Neophocaena phocaenoides) in Chinese coastal waters and the Yangtze River, Marine Biology, 157, 7, (1453), (2010).
    • , Genetic diversity of lake whitefish in lakes Michigan and Huron; sampling, standardization, and research priorities, Journal of Great Lakes Research, 36, (59), (2010).
    • , Influence of montane isolation and refugia on population structure ofSorex palustrisin western North America, Journal of Mammalogy, 91, 4, (1000), (2010).
    • , Defining population structure for the Mojave desert tortoise, Conservation Genetics, 11, 5, (1795), (2010).
    • , Genetic heterogeneity in populations of the Mediterranean shore crab, Carcinus aestuarii (Decapoda, Portunidae), from the Venice Lagoon, Estuarine, Coastal and Shelf Science, 87, 1, (135), (2010).
    • , Genetic homogeneity of weathervane scallops (Patinopecten caurinus) in the northeastern Pacific, Canadian Journal of Fisheries and Aquatic Sciences, 67, 11, (1827), (2010).
    • , DNA detective: a review of molecular approaches to wildlife forensics, Forensic Science, Medicine, and Pathology, 6, 3, (180), (2010).
    • , Matching Management to Biological Scale: Connectivity among Lacustrine Brook Trout Populations, North American Journal of Fisheries Management, 30, 5, (1132), (2010).
    • , Divergence with gene flow as facilitated by ecological differences: within-island variation in Darwin's finches, Philosophical Transactions of the Royal Society B: Biological Sciences, 365, 1543, (1041), (2010).
    • , High dispersal ability and low genetic differentiation in the widespread butterfly species Melanargia galathea, Journal of Insect Conservation, 14, 5, (467), (2010).
    • , Multiscale Diversity in the Marshes of the Georgia Coastal Ecosystems LTER, Estuaries and Coasts, 33, 4, (865), (2010).
    • , Genetic clustering methods reveal bull trout (Salvelinus confluentus) fine-scale population structure as a spatially nested hierarchy, Conservation Genetics, 10.1007/s10592-009-9969-y, 11, 4, (1421-1433), (2009).
    • , The effect of local population dynamics on patterns of isolation by distance, Ecological Informatics, 5, 3, (167), (2010).
    • , Rapid spatial genetic differentiation in an invasive species, the round goby Neogobius melanostomus in the Baltic Sea, Biological Invasions, 12, 8, (2609), (2010).
    • , Conserving the endangered Mexican fishing bat (Myotis vivesi): genetic variation indicates extensive gene flow among islands in the Gulf of California, Conservation Genetics, 11, 3, (813), (2010).
    • , Population Genetic Structure of the German Cockroach (Blattodea: Blattellidae) in Apartment Buildings, Journal of Medical Entomology, 47, 4, (553), (2010).
    • , Genetic structure in large, continuous mammal populations: the example of brown bears in northwestern Eurasia, Molecular Ecology, 19, 24, (5359), (2010).
    • , Subpopulations, locations and fragmentation: applying IUCN red list criteria to herbarium specimen data, Biodiversity and Conservation, 19, 7, (2071), (2010).
    • , A method for defining management units based on genetically determined close relatives, ICES Journal of Marine Science, 67, 3, (551), (2010).
    • , Hierarchical modelling of temperature and habitat size effects on population dynamics of North Atlantic cod, ICES Journal of Marine Science, 67, 5, (833), (2010).
    • , Applied Conservation Genetics and the Need for Quality Control and Reporting of Genetic Data Used in Fisheries and Wildlife Management, Journal of Heredity, 101, 1, (1), (2010).
    • , Spatio-temporal population structuring and genetic diversity retention in depleted Atlantic Bluefin tuna of the Mediterranean Sea, Proceedings of the National Academy of Sciences, 10.1073/pnas.0908281107, 107, 5, (2102-2107), (2010).
    • , Les fondateurs de la population de La Patrie (Cantons-de-l’Est) : Franco-américains, Québécois et Européens aux recensements canadiens de 1881 et de 1891, Cahiers québécois de démographie, 39, 2, (307), (2010).
    • , The population genetic structure of a common tropical damselfish on the Great Barrier Reef and eastern Papua New Guinea, Coral Reefs, 29, 2, (455), (2010).
    • , Larval Supply and Dispersal, Biofouling, (16-29), (2010).
    • , Genetic population structure of marine fish: mismatch between biological and fisheries management units, Fish and Fisheries, 10, 4, (361-395), (2009).
    • , Population structure in the catfish Trichogenes longipinnis: drift offset by asymmetrical migration in a tiny geographic range, Biological Journal of the Linnean Society, 97, 2, (259-274), (2009).
    • , Statistical inference, Type II error, and decision making under the US Endangered Species Act, Frontiers in Ecology and the Environment, 7, 9, (487-494), (2008).
    • , Genetic divergence is more tightly related to call variation than landscape features in the Amazonian frogs Physalaemus petersi and P. freibergi, Journal of Evolutionary Biology, 22, 9, (1839-1853), (2009).
    • , Conservation genetics and management implications for European grayling, Thymallus thymallus: synthesis of phylogeography and population genetics, Fisheries Management and Ecology, 16, 1, (37-51), (2008).
    • , Population structure of spotted salamanders (Ambystoma maculatum) in a fragmented landscape, Molecular Ecology, 18, 2, (235-247), (2009).
    • , Genetic structure of the migratory catfish Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) suggests homing behaviour, Ecology of Freshwater Fish, 18, 2, (215-225), (2008).
    • , FLOCK: a method for quick mapping of admixture without source samples, Molecular Ecology Resources, 9, 5, (1333-1344), (2009).
    • , Microsatellite variation, population structure, and bottlenecks in the threatened copperbelly water snake, Conservation Genetics, 10, 2, (465), (2009).
    • , Statistical methods in spatial genetics, Molecular Ecology, 18, 23, (4734-4756), (2009).
    • , Neutral markers mirror small‐scale quantitative genetic differentiation in an avian island population, Biological Journal of the Linnean Society, 97, 4, (867-875), (2009).
    • , Structural and functional connectivity of marine fishes within a semi‐enclosed Newfoundland fjord, Journal of Fish Biology, 75, 6, (1393-1409), (2009).
    • , tossm: an R package for assessing performance of genetic analytical methods in a management context, Molecular Ecology Resources, 9, 6, (1456-1459), (2009).
    • , On gene dispersal studies in complex landscapes: a reply to the comment on García (2005, 2007), Molecular Ecology, 18, 22, (4536-4540), (2009).
    • , Estimating connectivity in marine populations: an empirical evaluation of assignment tests and parentage analysis under different gene flow scenarios, Molecular Ecology, 18, 8, (1765-1776), (2009).
    • , Infecting epidemiology with genetics: a new frontier in disease ecology, Trends in Ecology & Evolution, 24, 1, (21), (2009).
    • , Accurate Inference of Subtle Population Structure (and Other Genetic Discontinuities) Using Principal Coordinates, PLoS ONE, 4, 1, (e4269), (2009).
    • , Black Bear Population Genetics in California: Signatures of Population Structure, Competitive Release, and Historical Translocation, Journal of Mammalogy, 90, 5, (1066), (2009).
    • , Genetic effects of long-term stock enhancement programs, Aquaculture, 290, 1-2, (69), (2009).
    • , Population genomics of marine fishes: identifying adaptive variation in space and time, Molecular Ecology, 18, 15, (3128-3150), (2009).
    • , Sixty years of anthropogenic pressure: a spatio‐temporal genetic analysis of brown trout populations subject to stocking and population declines, Molecular Ecology, 18, 12, (2549-2562), (2009).
    • , Fine‐scale population structure in a desert amphibian: landscape genetics of the black toad (Bufo exsul), Molecular Ecology, 18, 18, (3847-3856), (2009).
    • , Signatures of vicariance, postglacial dispersal and spawning philopatry: population genetics of the walleye Sander vitreus, Molecular Ecology, 18, 16, (3411-3428), (2009).
    • , The circular definition of populations and its implications for biological sampling, Molecular Ecology, 18, 5, (765-768), (2009).
    • , Inbreeding variability and population structure in the invasive haplodiploid palm‐seed borer (Coccotrypes dactyliperda), Journal of Evolutionary Biology, 22, 5, (1076-1087), (2009).
    • , Steelhead Genetic Diversity at Multiple Spatial Scales in a Managed Basin: Snake River, Idaho, North American Journal of Fisheries Management, 29, 3, (680-701), (2011).
    • , Genetic diversity and population structure in Malus sieversii, a wild progenitor species of domesticated apple, Tree Genetics & Genomes, 5, 2, (339), (2009).
    • , Multilocus assignment analyses reveal multiple units and rare migration events in the recently expanded yellow‐eyed penguin (Megadyptes antipodes), Molecular Ecology, 18, 11, (2390-2400), (2009).
    • , Conservation Genetics of Crested Newt Species Triturus cristatus and T. carnifex within a Contact Zone in Central Europe: Impact of Interspecific Introgression and Gene Flow, Diversity, 2, 11, (28), (2009).
    • , Perspectives on the application of molecular genetics to earthworm ecology, Pedobiologia, 52, 3, (191), (2009).
    • , Population differentiation of temperate amphibians in unpredictable environments, Molecular Ecology, 18, 15, (3185-3200), (2009).
    • , Spatial and temporal population genetic structure of four northeastern Pacific littorinid gastropods: the effect of mode of larval development on variation at one mitochondrial and two nuclear DNA markers, Molecular Ecology, 18, 10, (2165-2184), (2009).
    • , Species relative abundance and direction of introgression in oaks, Molecular Ecology, 18, 10, (2228-2242), (2009).
    • , Concordant genetic breaks, identified by combining clustering and tessellation methods, in two co‐distributed alpine plant species, Molecular Ecology, 18, 21, (4495-4507), (2009).
    • , Characterizing dispersal patterns in a threatened seabird with limited genetic structure, Molecular Ecology, 18, 24, (5074-5085), (2009).
    • , Outbreaks, gene flow and effective population size in the migratory locust, Locusta migratoria: a regional‐scale comparative survey, Molecular Ecology, 18, 5, (792-800), (2009).
    • , Tug of war between continental gene flow and rearing site philopatry in a migratory bird: the sex‐biased dispersal paradigm reconsidered, Molecular Ecology, 18, 4, (593-602), (2009).
    • , Drawing the lines: resolving fishery management units with simple fisheries data, Canadian Journal of Fisheries and Aquatic Sciences, 66, 8, (1256), (2009).
    • , Microsatellite DNA markers and morphometrics reveal a complex population structure in a merobenthic octopus species (Octopus maorum) in south-east Australia and New Zealand, Marine Biology, 10.1007/s00227-009-1160-y, 156, 6, (1183-1192), (2009).
    • , Molecular Estimation of Dispersal for Ecology and Population Genetics, Annual Review of Ecology, Evolution, and Systematics, 40, 1, (193), (2009).
    • , Evaluating the demographic significance of genetic homogeneity using a coalescent-based simulation: a case study with gag (Mycteroperca microlepis), Canadian Journal of Fisheries and Aquatic Sciences, 66, 10, (1821), (2009).
    • , Genetic principles for freshwater restoration in New Zealand, New Zealand Journal of Marine and Freshwater Research, 43, 3, (749), (2009).
    • , Comparative survey of within-river genetic structure in Atlantic salmon; relevance for management and conservation, Conservation Genetics, 10, 4, (869), (2009).
    • , Genetic isolation by distance and localized fjord population structure in Pacific cod (Gadus macrocephalus): limited effective dispersal in the northeastern Pacific Ocean, Canadian Journal of Fisheries and Aquatic Sciences, 66, 1, (153), (2009).
    • , Ancestry, population structure, and conservation genetics of Arctic grayling (Thymallus arcticus) in the upper Missouri River, USA, Canadian Journal of Fisheries and Aquatic Sciences, 66, 10, (1758), (2009).
    • , Panmixia in European eel revisited: no genetic difference between maturing adults from southern and northern Europe, Heredity, 103, 1, (82), (2009).
    • , Population Structure and Genetic Diversity of Moose in Alaska, Journal of Heredity, 100, 2, (170), (2009).
    • , The use of plasmodes as a supplement to simulations: A simple example evaluating individual admixture estimation methodologies, Computational Statistics & Data Analysis, 53, 5, (1755), (2009).
    • , Microsatellite variation in maize landraces from Northwestern Argentina: genetic diversity, population structure and racial affiliations, Theoretical and Applied Genetics, 119, 6, (1053), (2009).
    • , How much spatial structure can data for rock lobster off victoria, Australia support?, New Zealand Journal of Marine and Freshwater Research, 43, 1, (373), (2009).
    • , Impacts of supplementation: genetic diversity in supplemented and unsupplemented populations of summer chum salmon (Oncorhynchus keta) in Puget Sound (Washington, USA), Canadian Journal of Fisheries and Aquatic Sciences, 66, 8, (1216), (2009).
    • , Genetic structure of lake whitefish (Coregonus clupeaformis) in Lake Michigan, Canadian Journal of Fisheries and Aquatic Sciences, 66, 3, (382), (2009).
    • , Lumpers or splitters? Evaluating recovery and management plans for metapopulations of herring, ICES Journal of Marine Science, 66, 8, (1776), (2009).
    • , Gene Flow and Isolation among Populations of Marine Animals, Annual Review of Ecology, Evolution, and Systematics, 40, 1, (291), (2009).
    • , Sewall Wright and Gustave Malécot on Isolation by Distance, Philosophy of Science, 76, 5, (784), (2009).
    • , Review: Sampling Weedy and Invasive Plant Populations for Genetic Diversity Analysis, Weed Science, 57, 06, (593), (2009).
    • , How different is different? Defining management and conservation units for a problematic exploited species, Canadian Journal of Fisheries and Aquatic Sciences, 66, 9, (1617), (2009).
    • , Application of non-coding DNA regions in intraspecific analyses, Plant Systematics and Evolution, 282, 3-4, (281), (2009).
    • , Contrasting patterns of morphological and neutral genetic divergence among geographically proximate populations of sockeye salmon Oncorhynchus nerka in Lake Aleknagik, Alaska, Journal of Fish Biology, 73, 8, (1993-2004), (2008).
    • , Contrasting demographic and genetic estimates of dispersal in the endangered Coahuilan box turtle: a contemporary approach to conservation, Molecular Ecology, 17, 19, (4209-4221), (2008).
    • , Genetic structure in alpine brown trout Salmo trutta L. shows that indirect stocking affects native lake populations, Journal of Fish Biology, 72, 8, (1990-2001), (2008).
    • , INCORPORATING CATASTROPHIC RISK ASSESSMENTS INTO SETTING CONSERVATION GOALS FOR THREATENED PACIFIC SALMON, Ecological Applications, 18, 1, (246-257), (2008).
    • , EFFECT OF MUTATION ON GENETIC DIFFERENTIATION AMONG NONEQUILIBRIUM POPULATIONS, Evolution, 62, 9, (2250-2259), (2008).
    • , Communities, populations and individuals of arbuscular mycorrhizal fungi, New Phytologist, 178, 2, (253-266), (2008).
    • , History, chance and adaptation during biological invasion: separating stochastic phenotypic evolution from response to selection, Ecology Letters, 11, 8, (852-866), (2008).
    • , Elemental Conservation Units: Communicating Extinction Risk without Dictating Targets for Protection, Conservation Biology, 22, 1, (36-47), (2008).
    • , Impacts of massive landscape change on a carnivorous marsupial in south‐eastern Australia: inferences from landscape genetics analysis, Journal of Applied Ecology, 45, 6, (1732-1741), (2008).
    • , Representing genetic variation as continuous surfaces: an approach for identifying spatial dependency in landscape genetic studies, Ecography, 31, 6, (685-697), (2009).
    • , Determining spatial and temporal scales for management: lessons from whaling, Marine Mammal Science, 24, 1, (183-201), (2007).
    • , Genetic isolation and morphological divergence of Black Sea bottlenose dolphins, Biological Conservation, 141, 6, (1600), (2008).
    • , Genetic Assessment of Sheepshead Stock Structure in the Northern Gulf of Mexico: Morphological Divergence in the Face of Gene Flow, North American Journal of Fisheries Management, 28, 2, (592-606), (2011).
    • , Molecular ecological approaches to studying the evolutionary impact of selective harvesting in wildlife, Molecular Ecology, 17, 1, (221-235), (2007).
    • , Genetic estimates of contemporary effective population size: what can they tell us about the importance of genetic stochasticity for wild population persistence?, Molecular Ecology, 17, 15, (3428-3447), (2008).
    • , The influence of multiple dispersal mechanisms and landscape structure on population clustering and connectivity in fragmented artesian spring snail populations, Molecular Ecology, 17, 16, (3733-3751), (2008).
    • , Do outbreaks affect genetic population structure? A worldwide survey in Locusta migratoria, a pest plagued by microsatellite null alleles, Molecular Ecology, 17, 16, (3640-3653), (2008).
    • , Population structure in an endangered songbird: maintenance of genetic differentiation despite high vagility and significant population recovery, Molecular Ecology, 17, 16, (3628-3639), (2008).
    • , A genetic assessment of polyandry and breeding‐site fidelity in lemon sharks, Molecular Ecology, 17, 14, (3337-3351), (2008).
    • , Patterns of genetic variation in US federal bison herds, Molecular Ecology, 17, 23, (4963-4977), (2008).
    • , Disentangling interactions between adaptive divergence and gene flow when ecology drives diversification, Ecology Letters, 11, 6, (624-636), (2008).
    • , Advances in molecular technology and their impact on fisheries genetics, Fish and Fisheries, 9, 4, (473-486), (2008).
    • , Integrating genetic data into management of marine resources: how can we do it better?, Fish and Fisheries, 9, 4, (423-449), (2008).
    • , Paradigm shifts in marine fisheries genetics: ugly hypotheses slain by beautiful facts, Fish and Fisheries, 9, 4, (333-362), (2008).
    • , CHARACTERIZING SOURCE–SINK DYNAMICS WITH GENETIC PARENTAGE ASSIGNMENTS, Ecology, 89, 10, (2746-2759), (2008).
    • , MARKOV CHAIN MONTE CARLO METHODS FOR ASSIGNING LARVAE TO NATAL SITES USING NATURAL GEOCHEMICAL TAGS, Ecological Applications, 18, 8, (1901-1913), (2008).
    • , Patchy distribution of flexible genetic elements in bacterial populations mediates robustness to environmental uncertainty, FEMS Microbiology Ecology, 65, 3, (361-371), (2008).
    • , Introgression and dispersal among spotted owl (Strix occidentalis) subspecies, Evolutionary Applications, 1, 1, (161-171), (2008).
    • , The influence of family groups on inferences made with the program Structure, Molecular Ecology Resources, 8, 6, (1219-1229), (2008).
    • , Genetic Structure of Creek Chub, a Headwater Minnow, in an Impounded River System, Transactions of the American Fisheries Society, 137, 4, (962), (2008).
    • , Race, Risk and Medicine in the Age of ‘Your Own Personal Genome’, BioSocieties, 3, 4, (423), (2008).
    • , Using Subpopulation Structure for Barren-Ground Grizzly Bear Management, Ursus, 19, 2, (91), (2008).
    • , Species traits influence the genetic consequences of river fragmentation on two co-occurring redhorse (Moxostoma) species, Canadian Journal of Fisheries and Aquatic Sciences, 65, 9, (1892), (2008).
    • , Molecular diversity of populations of the Merodon ruficornis group (Diptera, Syrphidae) on the Balkan Peninsula, Journal of Zoological Systematics and Evolutionary Research, 46, 2, (143-152), (2008).
    • , Fisheries forensics: the use of DNA tools for improving compliance, traceability and enforcement in the fishing industry, Fish and Fisheries, 9, 4, (462-472), (2008).
    • , Seascape genetics and the spatial ecology of marine populations, Fish and Fisheries, 9, 4, (363-377), (2008).
    • , Mitochondrial and Nuclear Genetic Variation across Calving Lagoons in Eastern North Pacific Gray Whales (Eschrichtius robustus), Journal of Heredity, 100, 1, (34), (2008).
    • , Genetic effects of habitat fragmentation on blue sucker populations in the upper Missouri River (Cycleptus elongatus Lesueur, 1918), Conservation Genetics, 9, 4, (821), (2008).
    • , Evidence for multiple sources of invasion and intraspecific hybridization in Brachypodium sylvaticum (Hudson) Beauv. in North America, Molecular Ecology, 17, 21, (4657-4669), (2008).
    • , Low levels of relatedness on black grouse leks despite male philopatry, Molecular Ecology, 17, 20, (4512-4521), (2008).
    • , Landscape genetic analyses reveal cryptic population structure and putative selection gradients in a large‐scale estuarine environment, Molecular Ecology, 17, 17, (3901-3916), (2008).
    • , Estimating contemporary early life‐history dispersal in an estuarine fish: integrating molecular and otolith elemental approaches, Molecular Ecology, 17, 6, (1438-1450), (2008).
    • , Genetic and ecological data provide incongruent interpretations of population structure and dispersal in naturally subdivided populations of white‐tailed ptarmigan (Lagopus leucura), Molecular Ecology, 17, 8, (1905-1917), (2008).
    • , Congruent population structure inferred from dispersal behaviour and intensive genetic surveys of the threatened Florida scrub‐jay (Aphelocoma cœrulescens), Molecular Ecology, 17, 7, (1685-1701), (2008).
    • , Landscape characteristics influence morphological and genetic differentiation in a widespread raptor (Buteo jamaicensis), Molecular Ecology, 17, 3, (810-824), (2008).
    • , Colonization genetics of an animal‐dispersed plant (Vaccinium membranaceum) at Mount St Helens, Washington, Molecular Ecology, 17, 3, (731-740), (2008).
    • , Habitat fragmentation and genetic diversity of an endangered, migratory songbird, the golden‐cheeked warbler (Dendroica chrysoparia), Molecular Ecology, 17, 9, (2122-2133), (2008).
    • , Annual variation in source contributions to a mixed stock: implications for quantifying connectivity, Molecular Ecology, 17, 9, (2185-2193), (2008).
    • , Synchrony in local population dynamics of stream-dwelling Dolly Varden: do genetically similar groups show similar demography?, Population Ecology, 50, 4, (367), (2008).
    • , Can economic and biological management objectives be achieved by the use of MSY-based reference points? A North Sea plaice (Pleuronectes platessa) and sole (Solea solea) case study, ICES Journal of Marine Science, 65, 6, (1069), (2008).
    • , Evaluation of a remnant lake sturgeon population’s utility as a source for reintroductions in the Ohio River system, Conservation Genetics, 9, 5, (1195), (2008).
    • , Geographical Structuring of Genetic Diversity Across the Whole Distribution Range of Narcissus longispathus, a Habitat-specialist, Mediterranean Narrow Endemic, Annals of Botany, 102, 2, (183), (2008).
    • , Patterns of genetic diversity in Great Lakes bloaters (Coregonus hoyi) with a view to future reintroduction in Lake Ontario, Conservation Genetics, 9, 2, (281), (2008).
    • , Population structure and genetic diversity of black redhorse (Moxostoma duquesnei) in a highly fragmented watershed, Conservation Genetics, 9, 3, (531), (2008).
    • , Cryptic divergence and strong population structure in the colonial invertebrate Pycnoclavella communis (Ascidiacea) inferred from molecular data, Zoology, 111, 2, (163), (2008).
    • , Population structure and genetic diversity in Swainson’s Hawks (Buteo swainsoni): implications for conservation, Conservation Genetics, 9, 2, (305), (2008).
    • , Conservation genetics of the franciscana dolphin in Northern Argentina: population structure, by-catch impacts, and management implications, Conservation Genetics, 9, 2, (419), (2008).
    • , Genetic differentiation between morphotypes in the Antarctic limpet Nacella concinna as revealed by inter-simple sequence repeat markers, Marine Biology, 10.1007/s00227-008-0980-5, 154, 5, (875-885), (2008).
    • , Genetic Assessment of Lake Sturgeon Population Structure in the Laurentian Great Lakes, North American Journal of Fisheries Management, 28, 2, (572), (2008).
    • , Effects of Microsatellite Null Alleles on Assignment Testing, Journal of Heredity, 99, 6, (616), (2008).
    • , Inference of structure in subdivided populations at low levels of genetic differentiation—the correlated allele frequencies model revisited, Bioinformatics, 24, 19, (2222), (2008).
    • , The Performance of the Endangered Species Act, Annual Review of Ecology, Evolution, and Systematics, 39, 1, (279), (2008).
    • , Sex ratios in populations of Geranium sylvaticum in European Russia, Plant Species Biology, 22, 2, (125-128), (2007).
    • , Integrative use of spatial, genetic, and demographic analyses for investigating genetic connectivity between migratory, montane, and sedentary caribou herds, Molecular Ecology, 16, 20, (4223-4240), (2007).
    • , Broad‐ to fine‐scale population genetic patterning in the smallmouth bass Micropterus dolomieu across the Laurentian Great Lakes and beyond: an interplay of behaviour and geography, Molecular Ecology, 16, 8, (1605-1624), (2007).
    • , Directed connectivity among fish populations in a riverine network, Journal of Applied Ecology, 44, 6, (1116-1126), (2007).
    • , Incorporating multiple mixed stocks in mixed stock analysis: ‘many‐to‐many’ analyses, Molecular Ecology, 16, 4, (685-695), (2007).
    • , Evaluating the performance of a multilocus Bayesian method for the estimation of migration rates, Molecular Ecology, 16, 6, (1149-1166), (2007).
    • , Parasite phylogeographical congruence with salmon host evolutionarily significant units: implications for salmon conservation, Molecular Ecology, 16, 5, (993-1005), (2006).
    • , A new individual‐based spatial approach for identifying genetic discontinuities in natural populations, Molecular Ecology, 16, 10, (2031-2043), (2007).
    • , Detecting genetic structure in migrating bowhead whales off the coast of Barrow, Alaska, Molecular Ecology, 16, 10, (1993-2004), (2007).
    • , Genetic structure among continental and island populations of gyrfalcons, Molecular Ecology, 16, 15, (3145-3160), (2007).
    • , Life‐history and habitat features influence the within‐river genetic structure of Atlantic salmon, Molecular Ecology, 16, 13, (2638-2654), (2007).
    • , Editorial and Retrospective 2007, Molecular Ecology, 16, 1, (1-8), (2006).
    • , Detecting female precise natal philopatry in green turtles using assignment methods, Molecular Ecology, 16, 1, (61-74), (2006).
    • , Genetic population structure and contemporary dispersal patterns of a recent European invader, the Chinese mitten crab, Eriocheir sinensis, Molecular Ecology, 16, 2, (231-242), (2006).
    • , Comparative estimation of effective population sizes and temporal gene flow in two contrasting population systems, Molecular Ecology, 16, 18, (3866-3889), (2007).
    • , Defining population boundaries: use of three Bayesian approaches with microsatellite data from British natterjack toads (Bufo calamita), Molecular Ecology, 16, 4, (785-796), (2007).
    • , Microsatellite analysis reveals genetic differentiation between year-classes in the icefish Chaenocephalus aceratus at South Shetlands and Elephant Island, Polar Biology, 30, 12, (1605), (2007).
    • , Evaluating Population Structure of Black Bears on the Kenai Peninsula using Mitochondrial and Nuclear DNA Analyses, Journal of Mammalogy, 88, 5, (1288), (2007).
    • , Variation of Amplified Fragment Length Polymorphisms in Yukon River Chum Salmon: Population Structure and Application to Mixed-Stock Analysis, Transactions of the American Fisheries Society, 136, 4, (911), (2007).
    • , Conservation genetics of snowy plovers (Charadrius alexandrinus) in the Western Hemisphere: population genetic structure and delineation of subspecies, Conservation Genetics, 8, 6, (1287), (2007).
    • , Movement of adult edible crab (Cancer pagurus L.) at the Swedish West Coast by mark-recapture and acoustic tracking, Fisheries Research, 84, 3, (345), (2007).
    • , Estimating genealogies from unlinked marker data: A Bayesian approach, Theoretical Population Biology, 72, 3, (305), (2007).
    • , The utility of fast evolving molecular markers for studying speciation in the Antarctic benthos, Polar Biology, 30, 4, (513), (2007).
    • , Evolution of Mitochondrial DNA Variation within and among Yukon River Chum Salmon Populations, Transactions of the American Fisheries Society, 136, 4, (902-910), (2011).
    • , Footprints on water: the genetic wake of dispersal among reefs, Coral Reefs, 26, 3, (463), (2007).
    • , Applying new inter-individual approaches to assess fine-scale population genetic diversity in a neotropical frog, Eleutherodactylus ockendeni, Heredity, 99, 5, (506), (2007).
    • , Genetic Data and the Listing of Species Under the U.S. Endangered Species Act, Conservation Biology, 21, 5, (1186-1195), (2007).
    • , Behavioral innovation and phylogeography, Behavioral and Brain Sciences, 30, 04, (2007).
    • , Detecting population structure using STRUCTURE software: effect of background linkage disequilibrium, Heredity, 99, 4, (374), (2007).
    • , Population genetic structure in the North Atlantic Greenland halibut (Reinhardtius hippoglossoides): influenced by oceanic current systems?, Canadian Journal of Fisheries and Aquatic Sciences, 64, 6, (857), (2007).
    • , Population Subdivision of Fusarium graminearum Sensu Stricto in the Upper Midwestern United States, Phytopathology, 97, 11, (1434), (2007).
    • , Genetic and Ecological Divergence Defines Population Structure of Sockeye Salmon Populations Returning to Bristol Bay, Alaska, and Provides a Tool for Admixture Analysis, Transactions of the American Fisheries Society, 136, 1, (82), (2007).
    • , Hybridization and phylogeography of the Mozambique tilapia Oreochromis mossambicus in southern Africa evidenced by mitochondrial and microsatellite DNA genotyping, Conservation Genetics, 8, 2, (475), (2007).
    • , Blind population genetics survey of tropical rainforest trees, Molecular Ecology, 15, 12, (3505-3513), (2006).
    • , An empirical verification of population assignment methods by marking and parentage data: hatchery and wild steelhead (Oncorhynchus mykiss) in Forks Creek, Washington, USA, Molecular Ecology, 15, 11, (3157-3173), (2006).
    • , Decomposed pairwise regression analysis of genetic and geographic distances reveals a metapopulation structure of stream‐dwelling Dolly Varden charr, Molecular Ecology, 15, 11, (3175-3189), (2006).
    • , Genomics and conservation genetics, Trends in Ecology & Evolution, 21, 11, (629), (2006).
    • , Fine-scale population genetic structure of the Bengal tiger (Panthera tigris tigris) in a human-dominated western Terai Arc Landscape, India, PLOS ONE, 10.1371/journal.pone.0174371, 12, 4, (e0174371), (2017).
    • , Assessing Genetic Structure in Common but Ecologically Distinct Carnivores: The Stone Marten and Red Fox, PLOS ONE, 10.1371/journal.pone.0145165, 11, 1, (e0145165), (2016).
    • , Effects of Large-Scale Releases on the Genetic Structure of Red Sea Bream (Pagrus major, Temminck et Schlegel) Populations in Japan, PLOS ONE, 10.1371/journal.pone.0125743, 10, 5, (e0125743), (2015).
    • , QST–FST comparisons: evolutionary and ecological insights from genomic heterogeneity, Nature Reviews Genetics, 10.1038/nrg3395, 14, 3, (179-190), (2013)., (2013).
    • , Null alleles are ubiquitous at microsatellite loci in the Wedge Clam ( Donax trunculus ) , PeerJ, 10.7717/peerj.3188, 5, (e3188), (2017).
    • , Evidence for Isolation-by-Habitat among Populations of an Epiphytic Orchid Species on a Small Oceanic Island, PLoS ONE, 10.1371/journal.pone.0087469, 9, 2, (e87469), (2014).
    • , Mapping asthma-associated variants in admixed populations, Frontiers in Genetics, 10.3389/fgene.2015.00292, 6, (2015).
    • , One species or four? Yes!...and, no. Or, arbitrary assignment of lineages to species obscures the diversification processes of Neotropical fishes, PLOS ONE, 10.1371/journal.pone.0172349, 12, 2, (e0172349), (2017).
    • , The importance of considering genetic diversity in shark and ray conservation policies, Conservation Genetics, 10.1007/s10592-017-1038-3, (2017).
    • , Genetic analysis of goldsinny wrasse reveals evolutionary insights into population connectivity and potential evidence of inadvertent translocation via aquaculture, ICES Journal of Marine Science, 10.1093/icesjms/fsx046, (2017).
    • , Defining population boundaries: use of three Bayesian approaches with microsatellite data from British natterjack toads (Bufo calamita), Molecular Ecology, 10.1111/j.1365-294X.2007.03188.x, 0, 0, (070131125527003-???), (2007).
    • , Landscape genetics of fragmented forests: anticipating climate change by facilitating migration, iForest - Biogeosciences and Forestry, 10.3832/ifor0505-002, 2, 1, (128-132), (2009).
    • , Multi-Genetic Marker Approach and Spatio-Temporal Analysis Suggest There Is a Single Panmictic Population of Swordfish Xiphias gladius in the Indian Ocean, PLoS ONE, 10.1371/journal.pone.0063558, 8, 5, (e63558), (2013).
    • , Circumpolar Genetic Structure and Recent Gene Flow of Polar Bears: A Reanalysis, PLOS ONE, 10.1371/journal.pone.0148967, 11, 3, (e0148967), (2016).
    • , Hierarchical genetic structure of native masu salmon populations in Hokkaido, Japan, Environmental Biology of Fishes, 10.1007/s10641-018-0730-6, (2018).
    • , Gene flow connects coastal populations of a habitat specialist, the Clapper Rail Rallus crepitans, Ibis, , (2018).
    • , Fine-Scale Population Structure of Blue Whale Wintering Aggregations in the Gulf of California, PLoS ONE, 10.1371/journal.pone.0058315, 8, 3, (e58315), (2013).
    • , Killer whales (Orcinus orca) in Iceland show weak genetic structure among diverse isotopic signatures and observed movement patterns, Ecology and Evolution, , (2018).
    • , Colonisation and Diversification of the Zenaida Dove (Zenaida aurita) in the Antilles: Phylogeography, Contemporary Gene Flow and Morphological Divergence, PLoS ONE, 10.1371/journal.pone.0082189, 8, 12, (e82189), (2013).
    • , Should I Stay or Should I Go? Dispersal and Population Structure in Small, Isolated Desert Populations of West African Crocodiles, PLoS ONE, 10.1371/journal.pone.0094626, 9, 4, (e94626), (2014).
    • , Selection and Utility of Single Nucleotide Polymorphism Markers to Reveal Fine-Scale Population Structure in Human Malaria Parasite Plasmodium falciparum, Frontiers in Ecology and Evolution, 10.3389/fevo.2018.00145, 6, (2018).
    • , Postglacial range expansion shaped the spatial genetic structure in a marine habitat‐forming species: Implications for conservation plans in the Eastern Adriatic Sea, Journal of Biogeography, , (2018).
    • , Management implications of highly resolved hierarchical population genetic structure in thinhorn sheep, Conservation Genetics, 10.1007/s10592-018-1123-2, (2018).
    • , Genotyping-by-sequencing highlights patterns of genetic structure and domestication in artichoke and cardoon, PLOS ONE, 10.1371/journal.pone.0205988, 13, 10, (e0205988), (2018).
    • , A coalescent sampler successfully detects biologically meaningful population structure overlooked by F‐statistics, Evolutionary Applications, , (2018).