期刊
EVOLUTION
卷 69, 期 7, 页码 1823-1834出版社
OXFORD UNIV PRESS
DOI: 10.1111/evo.12696
关键词
biogeography; gene flow; hybrid zone; river barriers
资金
- Natural Sciences and Engineering Research Council of Canada [402013-2011]
- UTSC VPR-Research Competitiveness Fund
- Mitacs Student Fellowship
- FAPESPA [ICAAF 23/2011]
- CNPq (INCT em Biodiversidade e Uso da Terra da Amazonia) [574008/2008-0, 471342/2011-4, 310880/2012-2]
Many understory birds and other groups form genetically differentiated subspecies or closely related species on opposite sides of major rivers of Amazonia, but are proposed to come into geographic contact in headwater regions where narrower river widths may present less of a dispersal barrier. Whether such forms hybridize in headwater regions is generally unknown, but has important implications to our understanding of the role of rivers as drivers of speciation. We used a dataset of several thousand single nucleotide polymorphisms to show that seven taxon pairs that differentiate across a major Amazonian river come into geographic contact and hybridize in headwater regions. All taxon pairs possessed hybrids with low numbers of loci in which alleles were inherited from both parental species, suggesting they are backcrossed with parentals, and indicating gene flow between parental populations. Ongoing gene flow challenges rivers as the sole cause of in situ speciation, but is compatible with the view that the wide river courses in the heart of Amazonia may have driven interfluvial divergence during episodes of wet forest retraction away from headwater regions. Taxa as old as 4 Ma in our Amazonian dataset continue to hybridize at contact zones, suggesting reproductive isolation evolves at a slow pace.
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