High genomic diversity in the bank vole at the northern apex of a range expansion: The role of multiple colonizations and end-glacial refugia.

Autor: Marková S; Laboratory of Molecular Ecology, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Liběchov, Czech Republic., Horníková M; Laboratory of Molecular Ecology, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Liběchov, Czech Republic.; Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic., Lanier HC; Department of Biology, Program in Ecology & Evolutionary Biology, University of Oklahoma, Norman, OK, USA.; Sam Noble Museum, University of Oklahoma, Norman, OK, USA., Henttonen H; Natural Resources Institute Finland, Helsinki, Finland., Searle JB; Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA., Weider LJ; Department of Biology, Program in Ecology & Evolutionary Biology, University of Oklahoma, Norman, OK, USA., Kotlík P; Laboratory of Molecular Ecology, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Liběchov, Czech Republic.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2020 May; Vol. 29 (9), pp. 1730-1744. Date of Electronic Publication: 2020 May 18.
DOI: 10.1111/mec.15427
Abstrakt: The history of repeated northern glacial cycling and southern climatic stability has long dominated explanations for how genetic diversity is distributed within temperate species in Eurasia and North America. However, growing evidence indicates the importance of cryptic refugia for northern colonization dynamics. An important geographic region to assess this is Fennoscandia, where recolonization at the end of the last glaciation was restricted to specific routes and temporal windows. We used genomic data to analyse genetic diversity and colonization history of the bank vole (Myodes glareolus) throughout Europe (>800 samples) with Fennoscandia as the northern apex. We inferred that bank voles colonized Fennoscandia multiple times by two different routes; with three separate colonizations via a southern land-bridge route deriving from a "Carpathian" glacial refugium and one via a north-eastern route from an "Eastern" glacial refugium near the Ural Mountains. Clustering of genome-wide SNPs revealed high diversity in Fennoscandia, with eight genomic clusters: three of Carpathian origin and five Eastern. Time estimates revealed that the first of the Carpathian colonizations occurred before the Younger Dryas (YD), meaning that the first colonists survived the YD in Fennoscandia. Results also indicated that introgression between bank and northern red-backed voles (Myodes rutilus) took place in Fennoscandia just after end-glacial colonization. Therefore, multiple colonizations from the same and different cryptic refugia, temporal and spatial separations and interspecific introgression have shaped bank vole genetic variability in Fennoscandia. Together, these processes drive high genetic diversity at the apex of the northern expansion in this emerging model species.
(© 2020 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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