Circumpolar map of Quaternary deposits of the Arctic

Zarkhidze, V. S.; Fulton, R J; Mudie, Petra J.; Piper, David J. W.; Musatov, E.; Naryshkin, G D; Yashin, Dmitry

doi:10.4095/133242

Cited by 8 publications

(2 citation statements)

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“…As well as the persuasive terrestrial evidence for this large ice stream, Clark and Stokes (2001) noted that at the mouth of M'Clure Strait there is a significant bulge in the outline of the continental shelf break (Zarkhidze et al, 1991). They interpreted this feature as a large glacially-fed fan deposit (trough mouth fan:…”

Section: Evidence For a Major Ice Stream In M'clure Straitmentioning

confidence: 97%

Late Pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago

Stokes

Clark

Darby

et al. 2005

Global and Planetary Change

110

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Section: Evidence For a Major Ice Stream In M'clure Straitmentioning

confidence: 97%

Late Pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago

Stokes

Clark

Darby

et al. 2005

Global and Planetary Change

110

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“…The extensive glacial history of the Northern Hemisphere (e.g., Warheit 1992;Stein et al 1994;Hewitt 1996) suggests that vicariance due to glaciation may have been a major evolutionary force for northern taxa, and breeding distributions of subspecies of guillemots correspond closely with potential refugia. Quaternary stratigraphic analysis suggests that parts of Iceland (Zarkhidze et al 1991) and the region in the North American Arctic from the Mackenzie Delta to the Chukchi Sea (Dyke and Prest 1987) remained unglaciated at the peak of the Wisconsin glaciation -0.018 M.Y.B.P. (cf.…”

Section: Conclusion For Populationsmentioning

confidence: 99%

ANALYSIS OF MECHANISMS OF MICROEVOLUTIONARY CHANGE INCEPPHUSGUILLEMOTS USING PATTERNS OF CONTROL REGION VARIATION

Kidd

Friesen

1998

Evolution

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We surveyed population-level sequence variation in part of the mitochondrial control region for three species including eight subspecies of Cepphus guillemots (Charadriiformes: Alcidae) to test specific predictions about mechanisms of population differentiation. We found that sequences of spectacled guillemots (C. carbo) were more closely related to those of pigeon guillemots (C. columba; both found in the Pacific Ocean) than to those of black guillemots (C. grylle; Arctic and Atlantic Oceans), despite dissimilarities in plumage between spectacled guillemots and the other species. Distributions of species and timing of divergence events suggest that speciation involved allopatric and microallopatric populations isolated by Pleistocene glaciers. Control region sequences were significantly differentiated among populations within species and suggest that gene flow is low; however, populations are probably not in genetic equilibrium, so these results probably reflect historical isolation of colonies. In contrast, phylogenetic relationships among sequences within species were poorly resolved, probably because of a combination of incomplete lineage sorting and contemporary gene flow. Indices of genetic diversity provided no suggestion of recent bottlenecks in most populations, although two populations apparently underwent recent severe bottlenecks. Genetic divergence among populations was not correlated with geographic distance, which argues against isolation by distance. Results of these analyses, combined with breeding distributions and timing of divergence events, suggest that populations diverged during isolation in glacial refugia. Our results are consistent with earlier hypotheses posed by Storer and Udvardy.

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