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Whole-genome analysis of Mustela erminea finds that pulsed hybridization impacts evolution at high latitudes

May 31, 2018

At high latitudes, climatic shifts hypothetically initiate recurrent episodes of divergence by isolating populations in glacial refugia—ice-free regions that enable terrestrial species persistence. Upon glacial recession, populations subsequently expand and often come into contact with other independently diverging populations, resulting in gene flow. To understand how recurrent periods of isolation and contact may have impacted evolution at high latitudes, we investigated introgression dynamics in the stoat (Mustela erminea), a Holarctic mammalian carnivore, using whole-genome sequences. We identify two spatio-temporally distinct episodes of introgression coincident with large-scale climatic shifts: contemporary introgression in a mainland contact zone and ancient contact ~200 km south of the contemporary zone, in the archipelagos along North America’s North Pacific Coast. Repeated episodes of gene flow highlight the central role of cyclic climates in structuring high-latitude diversity, through refugial divergence and introgressive hybridization. When introgression is followed by allopatric isolation (e.g., insularization) it may ultimately expedite divergence.

Citation Information

Publication Year 2018
Title Whole-genome analysis of Mustela erminea finds that pulsed hybridization impacts evolution at high latitudes
DOI 10.1038/s42003-018-0058-y
Authors Jocelyn P. Colella, Tianying Lan, Stephen C. Schuster, Sandra L. Talbot, Joseph A. Cook, Charlotte Lindqvist
Publication Type Article
Publication Subtype Journal Article
Series Title Communications Biology
Index ID 70198672
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center Biology WTEB

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