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We studied populations of Sorer araneus Linnaeus, 1758 in the upper Drweca River valley and in the vicinity of Lake Szelag Wielki. We found that the dine of frequency of metacentric np decays in the Drweca River valley, which results in a smooth transition between the Stobnica race (karyotype hi, ko, gm, np) and the Laska race (hi, ko, gm). However, on the west shore of Lake Szelag Wielki the dine of frequency of metacentric gm disappears. Reduction of frequencies of autosomes np and gm makes possible broadening of the dines of metacentrics gr and mn, originating from the Legucki Mlyn race. This results in a reduction of the number of hybrids and maximization of frequency of recombinants (hi, ko, gr, mn), which reaches the value of 1.0 in the populations located on the west shore of the lake. We compared studied populations with those in the Pasleka River valley, and those between the Pasleka and Drweca Rivers valleys. We also discussed the maximization of the frequency of recombinants as a mechanism enhancing fertility of hybrid populations.

Maximatization of the frequency of recombinants in the hybrid zones of Sorex araneus in northern Poland