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Chromosomes of the Siberian Snow Sheep, Ovis Nivicola, and Implications Concerning the Origin of Amphiberingian wild Sheep (subgenus Pachyceros)

Published online by Cambridge University Press:  20 January 2017

K.V. Korobitsyna
Affiliation:
Institute of Biology and Pedology, Far East Scientific Center, Academy of Sciences of the USSR, Vladivostok 690022 USSR.
C.F. Nadler
Affiliation:
Department of Medicine, Northwestern University Medical School, Chicago, Illinois 60611 USA.
N.N. Vorontsov
Affiliation:
Institute of Biology and Pedology, Far East Scientific Center, Academy of Sciences of the USSR, Vladivostok 690022 USSR.
R.S. Hoffmann
Affiliation:
Museum of Natural History and Department of Systematics and Ecology, University of Kansas, Lawrence, Kansas 66045 USA.

Abstract

The chromosomes of Ovis nivicola, described for the first time, exhibit 2n = 52, the lowest diploid number to be reported for wild sheep and goats. The new chromosomal data, together with a review of the fossil history of the genus, lead us to conclude that the bighorned wild sheep (subgenus Pachyceros) evolved their distinctive characteristics while isolated in the ice-free Beringian refugium, and then migrated southward into western North America when the glacial barriers melted, as first suggested by Cowan (1940).

Type
Original Articles
Copyright
University of Washington

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