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We wish to bring readers attention to the following corrections to Ally et al. (2008). In Table 2, Clone 24-1 not Clone 25-1b has a somatic mutation at the microsatellite locus W17. The alleles remain unchanged. Clone 25-1b had no somatic mutations, and only two ramets were sampled for this clone. As it was below our threshold of 5 ramets, it was not included in any of the statistical analyses.

We calculated statistics based on the presence of an outlier with a πk = 0.079; however, this clone’s molecular divergence is πk = 0.034. These values do not change the overall pattern in the data, instead, they simply alter values reported in the text. The lower-bound estimate of the mutation rate using the clone exhibiting the largest amount of genetic diversity is μlower = 0.034/(4 × 10000) = 8.4 × 10−7per locus per year. Among clones with non-zero estimates, using TCCA = πk/(4μlower), clone age ranged from 415 to 10 000 years. The average clone age was estimated to be 3680 (SE = 627) years. As the upper-bound estimate of the mutation rate did not include the clone with the greatest divergence, this value remains at 2.3 × 10−5 per locus per year. In Fig. 1 and Table 1, the correct statistical values are reported here along with the revised figure and table.

image

Figure 1.  A comparison of two different growth models for Red Rock (solid circles) and Riske Creek (open circles). (a) Assuming a constant population size with continual ramet turn-over, the slope of πk versus inline image should exhibit a 1:1 relationship (dashed). The observed line (solid) had a significantly lower slope of 0.376 ± 0.084 (F1,25 = 20.08, P-value: 0.00014, R2 = 0.445). (b) Assuming a growing population size, the slope of πk vs. inline image should exhibit a 1:1 relationship (dashed). The observed line (solid) had a slope of 0.893± 0.18 (F1,25 = 23.68, P-value: 5.26 × 10−5, R2 = 0.48), which did not differ significantly from the expectation.

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Table 1.   Linear regression analyses between microsatellite divergence, πk, and clone size: area, square-root of area, perimeter (P) and maximum distance between two ramets (Dmax) for two different aspen populations
ModelFstat P-valuedfEstimate ± SER2
InterceptAreaPerimeterDmax
Riske creek
 Intercept Only 190.010 ± 0.002 P = 0.001    
 Model A1 Area0.147 P = 0.7051.187.21 × 10−3± 3.03 × 10−3P = 0.033.07 × 10−7± 8 × 10−7P = 0.705  0.008
 Model A2 Sqrt(Area)0.2079 P = 0.6531.186.33 × 10−3± 4.3 × 10−3P = 0.1593.82 × 10−5± 8.4 × 10−5P = 0.654  0.011
 Model B PM0.2773 P = 0.60491.185.98 × 10−3 ± 4.45 × 10−3P = 0.196 9.29× 10−5± 1.7 × 10−5P = 0.605 0.015
 Model C Dmax4.509 P = 0.0481.181.70 × 10−3± 3.57× 10−3P = 0.6394  5.62 × 10−5± 2.65× 10−5P = 0.0480.200
 Model C (no outlier)0.04969 P = 0.8261.175.96 × 10−3 ± 3.69 × 10−3P = 0.125  7.10 × 10−6± 3.18× 10−5P = 0.8260.0006

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