On the Specific Development Pattern
of a Clethrionomys rutilus Population

N. S. Moskvitina

Tomsk State University, pr. Lenina 36, Tomsk, 634050 Russia

Received March 25, 1999

Abstract—The analysis of ecological, morphophysiological, and phenotypic characters of a Clethrionomys
rutilus population from an island in Lake Chany revealed a number of specific features making it similar to tun-
dra populations of this species. It was shown that selection for certain phenotypes in combination with isolation
and variation in population size promoted the formation of a population adapted to severe winter conditions.

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