Hybridization in headwater regions, and the role of rivers as drivers of speciation in Amazonian birds

Evolution; International Journal of Organic Evolution
Jason T WeirAlexandre Aleixo

Abstract

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 ...Continue Reading

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Citations

Apr 13, 2017·Evolution; International Journal of Organic Evolution·Benjamin M Winger
Dec 28, 2017·Proceedings of the National Academy of Sciences of the United States of America·Alfredo O Barrera-GuzmánJason T Weir
Mar 9, 2018·Proceedings. Biological Sciences·Paola Pulido-SantacruzJason T Weir
Aug 15, 2019·Anais Da Academia Brasileira De Ciências·Camila C Ribas, Alexandre Aleixo
Aug 8, 2018·Science Advances·Luciano Nicolas Naka, Robb T Brumfield
Dec 28, 2019·Evolution; International Journal of Organic Evolution·Paola Pulido-SantacruzJason T Weir
Apr 5, 2020·Evolution; International Journal of Organic Evolution·Jente Ottenburghs
Feb 5, 2019·Ecology Letters·Vanessa E Luzuriaga-Aveiga, Jason T Weir
Jul 10, 2019·Science Advances·Sofia Marques SilvaAlexandre Aleixo
Sep 29, 2020·Evolution; International Journal of Organic Evolution·Áurea A CronembergerJason T Weir
Dec 28, 2018·Molecular Phylogenetics and Evolution·Brendan J PintoTony Gamble
Sep 10, 2017·Molecular Phylogenetics and Evolution·Bryan C CarstensBrian C O'Meara

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