Sorex cinereus group Beringian clade

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From Hope et al. (2012): "The Beringian clade contains eight species, six of which occupy the tundra and taiga biomes at northern high-latitudes. Sorex ugyunak occurs in tundra of northernmost Alaska and Canada, having expanded eastward out of the Beringian refugium following retreat of continental ice sheets since the Last Glacial Maximum (LGM) to occupy its current distribution. Sorex jacksoni (St. Lawrence Island) and Sorex pribilofensis (St. Paul Island) are island endemics of the Bering Sea that are found in tundra habitat and represent remnants of a previously more widespread distribution across the Beringian Isthmus that existed (10,000–16,000 BP) before inundation (Hopkins et al., 1982). Sorex portenkoi occupies tundra within portions of Chukotka and northern Kamchatka in Siberia and Sorex camtschatica is found in tundra and taiga both on the Kamtchatka Peninsula and southern Magadanskaya Region, Russia. Sorex leucogaster is also an insular endemic known only from Paramushir Island within the Kurile group. Although these northernmost forms are described as separate species, their taxonomic status is still debated (Demboski and Cook, 2003). Divergence of mtDNA is minimal suggesting a recent common ancestor. Other members of the Beringian clade occur farther south in North America. Sorex haydeni occupies grasslands of the northern and central prairies and to a lesser extent deciduous forest. Sorex preblei occupies arid sagebrush shrubland centered on the Columbia Basin. An early dichotomy within the Beringian clade, as indicated from mtDNA, separates S. preblei from other members, followed by divergence of S. haydeni (Demboski and Cook, 2003)."

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References

Demboski JR, Cook JA. 2003. Phylogenetic diversification within the Sorex cinereus group (Soricidae). Journal of Mammalogy 84(1): 144-158.

Hope AG, Speer KA, Demboski JR, Talbot SL, Cook JA. 2012. A climate for speciation: rapid spatial diversification within the Sorex cinereus complex of shrews. Molecular Phylogenetics and Evolution 64(3): 671-684.

Hopkins DM, Matthews JV, Schweger CE, Young SB. 1982. Paleoecology of Beringia. Academic Press, New York.