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dc.contributor.authorPeeters, Bart
dc.contributor.authorLe Moullec, Mathilde
dc.contributor.authorRaeymaekers, Joost A. M.
dc.contributor.authorFredricson Marquez, Jonatan
dc.contributor.authorRøed, Knut
dc.contributor.authorPedersen, Åshild Ønvik
dc.contributor.authorVeiberg, Vebjørn
dc.contributor.authorLoe, Leif Egil
dc.contributor.authorHansen, Brage Bremset
dc.identifier.citationGlobal Change Biology. 2019, 26 (4), 2028-2041.en_US
dc.description.abstractSea ice loss may have dramatic consequences for population connectivity, extinction–colonization dynamics, and even the persistence of Arctic species subject to climate change. This is of particular concern in face of additional anthropogenic stressors, such as overexploitation. In this study, we assess the population‐genetic implications of diminishing sea ice cover in the endemic, high Arctic Svalbard reindeer (Rangifer tarandus platyrhynchus) by analyzing the interactive effects of landscape barriers and reintroductions (following harvest‐induced extirpations) on their metapopulation genetic structure. We genotyped 411 wild reindeer from 25 sampling sites throughout the entire subspecies' range at 19 microsatellite loci. Bayesian clustering analysis showed a genetic structure composed of eight populations, of which two were admixed. Overall population genetic differentiation was high (mean FST = 0.21). Genetic diversity was low (allelic richness [AR] = 2.07–2.58; observed heterozygosity = 0.23–0.43) and declined toward the outer distribution range, where populations showed significant levels of inbreeding. Coalescent estimates of effective population sizes and migration rates revealed strong evolutionary source–sink dynamics with the central population as the main source. The population genetic structure was best explained by a landscape genetics model combining strong isolation by glaciers and open water, and high connectivity by dispersal across winter sea ice. However, the observed patterns of natural isolation were strongly modified by the signature of past harvest‐induced extirpations, subsequent reintroductions, and recent lack of sea ice. These results suggest that past and current anthropogenic drivers of metapopulation dynamics may have interactive effects on large‐scale ecological and evolutionary processes. Continued loss of sea ice as a dispersal corridor within and between island systems is expected to increase the genetic isolation of populations, and thus threaten the evolutionary potential and persistence of Arctic wildlife.en_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.titleSea ice loss increases genetic isolation in a high Arctic ungulate metapopulationen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.source.journalGlobal Change Biologyen_US
dc.relation.projectNorges forskningsråd: 246054en_US
dc.relation.projectNorges forskningsråd: 235652en_US
dc.relation.projectNorges forskningsråd: 244647en_US
dc.relation.projectNorges forskningsråd: 257173en_US
dc.relation.projectNorges forskningsråd: 223257en_US
dc.relation.projectSvalbards miljøvernfond: 15/105en_US
dc.relation.projectSvalbards miljøvernfond: 14/137en_US
dc.relation.projectNorges forskningsråd: 276080en_US
dc.description.localcodeThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. © 2019 The Authorsen_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse-Ikkekommersiell 4.0 Internasjonal