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1 Acta Theriologica. Supplement

1 1997

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Cytogenetic homeostasis and population density in red-backed voles Clethrionomys glareolus and C.rutilus in central Siberia

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Dmitriev S. G. , Zakharov V. M. , Sheftel B. I.

Acta Theriologica. Supplement

1997

nr 04

We examined frequency of chromosome aberration in somatic cells in sympatric growing populations of bank vole Clethrionomys glareolus Schreber, 1780 and ruddy vole C. rutilus Pallas, 1779 in central Siberia (Yenisei river island, 62°N, 89°E) from 1992 to 1994. The island was reinhabited from the mainland populations in 1992 after abnormally high flooding which eliminated the previous island populations of the species. The frequency of chromosome aberration increased parallel to the population density of island populations of both species in 1992-1994. In the mainland population of C. rutilus in 1994, the year of low density for this highly cyclic population, significantly lower frequency of chromosome aberration was found as compared with an island population characterized by high density in this year. These results are interpreted as a disturbance of cytogenetic homeostasis indicating an alteration in an organism's condition in the overcrowded populations of both species under study.