Postzygotic isolation drives genomic speciation between highly cryptic Hypocnemis antbirds from Amazonia

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Cronemberger , A A , Aleixo , A , Mikkelsen , E K & Weir , J T 2020 , ' Postzygotic isolation drives genomic speciation between highly cryptic Hypocnemis antbirds from Amazonia ' , Evolution , vol. 74 , no. 11 , pp. 2512-2525 . https://doi.org/10.1111/evo.14103

Title: Postzygotic isolation drives genomic speciation between highly cryptic Hypocnemis antbirds from Amazonia
Author: Cronemberger, Aurea A.; Aleixo, Alexandre; Mikkelsen, Else K.; Weir, Jason T.
Contributor: University of Helsinki, Zoology
Date: 2020-11
Language: eng
Number of pages: 14
Belongs to series: Evolution
ISSN: 0014-3820
URI: http://hdl.handle.net/10138/335106
Abstract: How species evolve reproductive isolation in the species-rich Amazon basin is poorly understood in vertebrates. Here, we sequenced a reference genome and used a genome-wide sample of SNPs to analyze a hybrid zone between two highly cryptic species ofHypocnemiswarbling-antbirds-the Rondonia warbling-antbird (H. ochrogyna) and Spix's warbling-antbird (H. striata)-in a headwater region of southern Amazonia. We found that both species commonly hybridize, producing F(1)s and a variety of backcrosses with each species but we detected only one F-2-like hybrid. Patterns of heterozygosity, hybrid index, and interchromosomal linkage disequilibrium in hybrid populations closely match expectations under strong postzygotic isolation. Hybrid zone width (15.4 km) was much narrower than expected (211 km) indicating strong selection against hybrids. A remarkably high degree of concordance in cline centers and widths across loci, and a lack of reduced interspecificF(st)between populations close to versus far from the contact zone, suggest that genetic incompatibilities have rendered most of the genome immune to introgression. These results support intrinsic postzygotic isolation as a driver of speciation in a moderately young cryptic species pair from the Amazon and suggest that species richness of the Amazon may be grossly underestimated.
Subject: Amazon
genetic incompatibility
hybridization
Hypocnemis
postzygotic reproductive isolation
speciation
SPECIES LIMITS
ANTBIRDS THAMNOPHILIDAE
EVOLUTION
INTROGRESSION
DIVERGENCE
REGIONS
COMPLEX
STACKS
1181 Ecology, evolutionary biology
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