These authors contributed equally to this work.
Gene flow maintains genetic diversity and colonization potential in recently range-expanded populations of an Oriental bird, the Light-vented Bulbul (Pycnonotus sinensis, Aves: Pycnonotidae)
Article first published online: 11 MAR 2013
© 2013 John Wiley & Sons Ltd
Diversity and Distributions
Volume 19, Issue 10, pages 1248–1262, October 2013
How to Cite
Song, G., Yu, L., Gao, B., Zhang, R., Qu, Y., Lambert, D. M., Li, S., Zhou, T., Lei, F. (2013), Gene flow maintains genetic diversity and colonization potential in recently range-expanded populations of an Oriental bird, the Light-vented Bulbul (Pycnonotus sinensis, Aves: Pycnonotidae). Diversity and Distributions, 19: 1248–1262. doi: 10.1111/ddi.12067
- Issue published online: 6 SEP 2013
- Article first published online: 11 MAR 2013
- The National Science Fund for Distinguished Young Scientists. Grant Number: 30925008
- NSFC Young Scientists Fund. Grant Number: 31101630
- The Major International (Regional) Joint Research Project. Grant Number: 31010103901
- NSFC. Grant Number: 30670276
- distribution shifts;
- evolutionary history;
- frontier population;
- global changes
Two alternative genetic patterns are typical in recently established populations. One is reduced genetic diversity but significant population structuring compared with original populations. The other is the persistence of genetic polymorphisms and the lack of differentiation in frontier populations. This study aims to test for these patterns by examining population genetics of the Light-vented Bulbul (Pycnonotus sinensis), an Oriental bird that has been undergoing rapid range expansion.
Molecular analyses were conducted on mitochondrial DNA and microsatellite datasets from 256 individuals. Intraspecific phylogeny was reconstructed by Bayesian inference and network analysis. Analysis of molecular variance (AMOVA) and Bayesian clustering were applied to determine population structure. Genetic diversity was tested to determine whether there were significant differences between frontier and source populations. Population expansions were tested in mtDNA and microsatellites. Gene flow and recent migrants were estimated by Bayesian methods.
Both high- and low-nucleotide diversities were recorded in frontier populations, and differences in genetic diversity between frontier and source populations were not statistically significant. Population differentiation was recorded in some source but not in frontier populations. Population size expansion was detected both in frontier and in source populations, and for the whole dataset, commencing before the Last Glacial Maximum.
Genetic diversity can be maintained in expanding populations of the Light-vented Bulbul, and genetic differentiation can be avoided, where substantial genetic exchanges are occurring. This study also discusses the potential effects of evolutionary properties such as historical population growth on recently recorded range expansion.