River network rearrangements promote speciation in lowland Amazonian birds

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Musher , L J , Giakoumis , M , Albert , J , Del-Rio , G , Rego , M , Thom , G , Aleixo , A , Ribas , C C , Brumfield , R T , Smith , B T & Cracraft , J 2022 , ' River network rearrangements promote speciation in lowland Amazonian birds ' , Science Advances , vol. 8 , no. 14 , 1099 . https://doi.org/10.1126/sciadv.abn1099

Title: River network rearrangements promote speciation in lowland Amazonian birds
Author: Musher, Lukas J.; Giakoumis, Melina; Albert, James; Del-Rio, Glaucia; Rego, Marco; Thom, Gregory; Aleixo, Alexandre; Ribas, Camila C.; Brumfield, Robb T.; Smith, Brian Tilston; Cracraft, Joel
Contributor organization: Zoology
Date: 2022-04-08
Language: eng
Number of pages: 15
Belongs to series: Science Advances
ISSN: 2375-2548
DOI: https://doi.org/10.1126/sciadv.abn1099
URI: http://hdl.handle.net/10138/345764
Abstract: Large Amazonian rivers impede dispersal for many species, but lowland river networks frequently rearrange, thereby altering the location and effectiveness of river barriers through time. These rearrangements may promote biotic diversification by facilitating episodic allopatry and secondary contact among populations. We sequenced genome-wide markers to evaluate the histories of divergence and introgression in six Amazonian avian species complexes. We first tested the assumption that rivers are barriers for these taxa and found that even relatively small rivers facilitate divergence. We then tested whether species diverged with gene flow and recovered reticulate histories for all species, including one potential case of hybrid speciation. Our results support the hypothesis that river rearrangements promote speciation and reveal that many rainforest taxa are micro-endemic, unrecognized, and thus threatened with imminent extinction. We propose that Amazonian hyper-diversity originates partly from fine-scale barrier displacement processes-including river dynamics-which allow small populations to differentiate and disperse into secondary contact.
Subject: 1181 Ecology, evolutionary biology
1184 Genetics, developmental biology, physiology
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: publishedVersion


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