Abstract
The adaptation mechanisms in Phylloscopus warblers to habitat conditions associated with their reproduction, namely, the sex ratio, family structure, duration of sexual activity, etc., have been studied. The brood sex ratio is established to be about 1: 1 among juveniles, but males begin to predominate with time. In the reproductive period, some males remain unmated for a long time or even over the whole season. On the other hand, nesting males create pairs with second females. Visual observations and the results of a family structure analysis by means of molecular-genetic methods have shown that female “adultery” and/or forcible copulations with alien males occur from time to time, which leads to the appearance of extra-pair paternity. A PCR analysis revealed a high level of genetic diversity within the local populations of all the Phylloscopus warbler species, but the diversity for wood and greenish warblers (new species for the region) was lower than that for chiff-chaffs and willow warblers (species native to the region).
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