Genetic changes in seasonal generations of the bank vole

Examination was made of 17 different proteins coded by 36 loci (33 loci in spring) in the bank vole Clethrionomys glareolus (Schreber, 1780) caught in April-May (spring generation) and in September-October (autumn generation). The autumn population consisted of resident and migrating individuals, while only resident voles were caught in spring. It was therefore possible to make comparisons of allele frequency, genotypic fixation indexes and heterozygosity (H) between these three groups of voles and to calculate genetic similarity.