| 1. |
- Hold, Katharina, et al.
(författare)
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Ancient reindeer mitogenomes reveal island-hopping colonisation of the Arctic archipelagos
- 2024
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Ingår i: Scientific Reports. - : Springer Nature. - 2045-2322. ; 14:1
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Tidskriftsartikel (refereegranskat)abstract
- Climate warming at the end of the last glacial period had profound effects on the distribution of cold-adapted species. As their range shifted towards northern latitudes, they were able to colonise previously glaciated areas, including remote Arctic islands. However, there is still uncertainty about the routes and timing of colonisation. At the end of the last ice age, reindeer/caribou (Rangifer tarandus) expanded to the Holarctic region and colonised the archipelagos of Svalbard and Franz Josef Land. Earlier studies have proposed two possible colonisation routes, either from the Eurasian mainland or from Canada via Greenland. Here, we used 174 ancient, historical and modern mitogenomes to reconstruct the phylogeny of reindeer across its whole range and to infer the colonisation route of the Arctic islands. Our data shows a close affinity among Svalbard, Franz Josef Land and Novaya Zemlya reindeer. We also found tentative evidence for positive selection in the mitochondrial gene ND4, which is possibly associated with increased heat production. Our results thus support a colonisation of the Eurasian Arctic archipelagos from the Eurasian mainland and provide some insights into the evolutionary history and adaptation of the species to its High Arctic habitat.
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| 2. |
- Yannic, Glenn, et al.
(författare)
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Systematics of snow voles (Chionomys, Arvicolinae) revisited
- 2012
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Ingår i: Molecular Phylogenetics and Evolution. - : Elsevier BV. - 1055-7903 .- 1095-9513. ; 62:3, s. 806-815
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Tidskriftsartikel (refereegranskat)abstract
- To elucidate the evolutionary history of snow voles, genus Chionomys, we studied the phylogeography of Chionomys nivalis across its range and investigated its relationships with two congeneric species, Chionomys gud and Chionomys roberti, using independent molecular markers. Analyses were based on mitochondrial (similar to 940 bp cyt b) and Y-chromosomal (similar to 2020 bp from three introns) genetic variation. Our data provide conclusive evidence for a Caucasian and Middle Eastern origin for the three species and a subsequent westward expansion of C. nivalis. In addition, we discuss the taxonomic status of the genus Chionomys in relation to the genus Microtus.
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