The dynamics of introgression across an avian radiation

Evolution Letters

卷:5

Michael G. Harvey¹  Sonal Singhal²  Graham E. Derryberry³  Elizabeth P. Derryberry³  Gustavo A. Bravo⁴  Robb T. Brumfield⁵ 

[1] Department of Biological Sciences The University of Texas at El Paso El Paso Texas 79968;

[2] Department of Biology California State University, Dominguez Hills Carson California 90747;

[3] Department of Ecology and Evolutionary Biology University of Tennessee Knoxville Tennessee 37996;

[4] Department of Organismic and Evolutionary Biology Harvard University Cambridge Massachusetts 02138;

[5] Museum of Natural Science Louisiana State University Baton Rouge Louisiana 70803;

关键词: Diversification;    gene tree discordance;    hybridization;    incomplete lineage sorting;    introgression;    Neotropics;   

DOI  :  10.1002/evl3.256

来源: DOAJ

【 摘 要 】

Abstract Hybridization and resulting introgression can play both a destructive and a creative role in the evolution of diversity. Thus, characterizing when and where introgression is most likely to occur can help us understand the causes of diversification dynamics. Here, we examine the prevalence of and variation in introgression using phylogenomic data from a large (1300+ species), geographically widespread avian group, the suboscine birds. We first examine patterns of gene tree discordance across the geographic distribution of the entire clade. We then evaluate the signal of introgression in a subset of 206 species triads using Patterson's D‐statistic and test for associations between introgression signal and evolutionary, geographic, and environmental variables. We find that gene tree discordance varies across lineages and geographic regions. The signal of introgression is highest in cases where species occur in close geographic proximity and in regions with more dynamic climates since the Pleistocene. Our results highlight the potential of phylogenomic datasets for examining broad patterns of hybridization and suggest that the degree of introgression between diverging lineages might be predictable based on the setting in which they occur.

【 授权许可】

Unknown