Ancient diversification in glacial refugia leads to intraspecific diversity in a Holarctic mammal

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• 作者：Jean L. Polfus ; Micheline Manseau ; Cornelya F.C. Kl&uuml ; tsch ; Deborah Simmons and Paul J. Wilson
• 刊名：Journal of Biogeography
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：44
• 期：2
• 页码：386-396
• 全文大小：804K
• ISSN：1365-2699

文摘

Glacial-interglacial cycles influenced the contemporary genetic structure of many North American species. While phylogeographical lineage divergence among Pleistocene refugia has been proposed as a significant driver of subspecific and ecotypic differentiation, emerging evidence highlights the role of diversification within refugia in producing post-glacial variation. Caribou (Rangifer tarandus) exhibit significant morphological, ecological and behavioural phenotypic variation and occurred within Beringian and sub-Laurentide refugia. More specifically, the boreal ecotype of woodland caribou ranges from the southern regions of Canada to the Northwest Territories (NWT). Woodland caribou are generally accepted to have evolved south of the glacial extent, but the boreal ecotype in the northern part of their range co-occurs with caribou that have a Beringian origin. This proximity provides an opportunity to test whether woodland caribou colonized boreal habitats from a single southern refugial source or if independent evolution to a common ecotype resulted from diversification within refugia.