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Parallel plumage colour evolution and introgressive hybridization in wheatears
Nat Hist Museum Bern, Bern, Switzerland.
Ludwig Maximilians Univ Munchen, Dept Biol 2, Evolutionary Biol, Martinsried, Germany.
Ferdowsi Univ Mashhad, Dept Biol, Fac Sci, Mashhad, Iran.
Ferdowsi Univ Mashhad, Dept Biol, Fac Sci, haMashd, Iran.
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2019 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 32, no 1, p. 100-110Article in journal (Refereed) Published
Abstract [en]

Genetic and phenotypic mosaics, in which various phenotypes and different genomic regions show discordant patterns of species or population divergence, offer unique opportunities to study the role of ancestral and introgressed genetic variation in phenotypic evolution. Here, we investigated the evolution of discordant phenotypic and genetic divergence in a monophyletic clade of four songbird taxa-pied wheatear (O. pleschanka), Cyprus wheatear (Oenanthe cypriaca), and western and eastern subspecies of black-eared wheatear (O. h. hispanica and O. h. melanoleuca). Phenotypically, black back and neck sides distinguish pied and Cyprus wheatears from the white-backed/necked black-eared wheatears. Meanwhile, mitochondrial variation only distinguishes western black-eared wheatear. In the absence of nuclear genetic data, and given frequent hybridization among eastern black-eared and pied wheatear, it remains unclear whether introgression is responsible for discordance between mitochondrial divergence patterns and phenotypic similarities, or whether plumage coloration evolved in parallel. Multispecies coalescent analyses of about 20,000 SNPs obtained from RAD data mapped to a draft genome assembly resolve the species tree, provide evidence for the parallel evolution of colour phenotypes and establish western and eastern black-eared wheatears as independent taxa that should be recognized as full species. The presence of the entire admixture spectrum in the Iranian hybrid zone and the detection of footprints of introgression from pied into eastern black-eared wheatear beyond the hybrid zone despite strong geographic structure of ancestry proportions furthermore suggest a potential role for introgression in parallel plumage colour evolution. Our results support the importance of standing heterospecific and/or ancestral variation in phenotypic evolution.

Place, publisher, year, edition, pages
2019. Vol. 32, no 1, p. 100-110
Keywords [en]
incomplete lineage sorting, introgression, melanin-based coloration, standing genetic variation
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-375851DOI: 10.1111/jeb.13401ISI: 000455543700009PubMedID: 30421480OAI: oai:DiVA.org:uu-375851DiVA, id: diva2:1284851
Funder
Knut and Alice Wallenberg FoundationSwedish Research CouncilScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceAvailable from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved

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Suh, AlexanderBurri, Reto

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