O. A. Pyastolova and V. L. Vershinin
Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences, ul. Vos’mogo Marta 202,
Ekaterinburg, 620144 Russia
Received January 16, 1996
Abstract—The study of Rana arvalis Nilss. population inhabiting the area of Lake Berdanish, which is con-
taminated with radionuclides to a density of 1000–500 Ci/km2, revealed several specific cytological, cytoge-
netic, and phenotypic features indicating potential genetic risk for populations of this territory. The structure of
the population under study differs from that of other natural R. arvalis populations, reflecting the unfavorable
ecological situation in the area, and provides evidence for the presence of specific adaptive features ensuring
the existence and reproduction of species populations under new conditions.
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