Inferring the geographic mode of speciation by contrasting autosomal and sex-linked genetic diversity

Chu, Jui-Hua; Wegmann, Daniel; Yeh, Chia-Fen; Lin, Rong-Chien; Yang, Xiao-Jun; Lei, Fu-Min; Yao, Cheng-Te; Zou, Fa-Sheng; Li, Shou-Hsien

doi:10.1093/molbev/mst140

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Journal article

Inferring the geographic mode of speciation by contrasting autosomal and sex-linked genetic diversity

Chu, Jui-Hua Department of Life Science, National Taiwan Normal University, Taipei, Taiwan - Center for Systems Biology, National Taiwan University, Taipei, Taiwan
Wegmann, Daniel Department of Biology, University of Fribourg, Switzerland
Yeh, Chia-Fen Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
Lin, Rong-Chien Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
Yang, Xiao-Jun Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
Lei, Fu-Min Institute of Zoology, Chinese Academy of Sciences, Beijing, China
Yao, Cheng-Te Division of Zoology, Endemic Species Research Institute, Chi-Chi, Nantou, Taiwan
Zou, Fa-Sheng South China Institute of Endangered Animals, Guangzhou, China
Li, Shou-Hsien Department of Life Science, National Taiwan Normal University, Taipei, Taiwan

16.08.2013

Published in:

Molecular Biology and Evolution. - 2013, vol. 30, no. 11, p. 2519-2530

English When geographic isolation drives speciation, concurrent termination of gene flow among genomic regions will occur immediately after the formation of the barrier between diverging populations. Alternatively, if speciation is driven by ecologically divergent selection, gene flow of selectively neutral genomic regions may go on between diverging populations until the completion of reproductive isolation. It may also lead to an unsynchronized termination of gene flow between genomic regions with different roles in the speciation process. Here we developed a novel Approximate Bayesian Computation pipeline to infer the geographic mode of speciation by testing for a lack of postdivergence gene flow and a concurrent termination of gene flow in autosomal and sex-linked markers jointly. We applied this approach to infer the geographic mode of speciation for two allopatric highland rosefinches, the vinaceous rosefinch Carpodacus vinaceus and the Taiwan rosefinch C. formosanus from DNA polymorphisms of both autosomal and Z-linked loci. Our results suggest that the two rosefinch species diverged allopatrically approximately 0.5 million years ago. Our approach allowed us further to infer that female effective population sizes are about five times larger than those of males, an estimate potentially useful when comparing the intensity of sexual selection across species.

Faculty

Faculté des sciences et de médecine

Department

Département de Biologie

Language