River network rearrangements promote speciation in lowland Amazonian birds.

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 rearra

SUBMITTER: Musher LJ 

PROVIDER: S-EPMC8993111 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature