Abstract
Natural hybridization of the fire-bellied toad ( Bombina bombina ) and the yellowbellied toad ( Bombina variegata ) takes place in Western Ukraine. As a result, the hybrid zone has occurred, part of which stretches along North-West Pre-Carpathians. The research results have made it possible to establish the ecological pecularities both hybrids and parental species of the Bellied-Toads concerning their habitat choice. To determine the Bellied-Toads individuals phenetic differences between the species were used. As a result, established taxonomic affiliation, the detailed habitat preferencies of the Bellied-Toads were found out. The Fire-bellied Toad usually chooses large natural ponds with clear water and aquatic vegetation, the Yellow-Bellied Toad chooses small puddles of anthropogenic origin with muddy water and without aquatic vegetation; the hybrids are present in water reservoirs of different types preferring ones of anthropogenic origin mostly with muddy water and without aquatic vegetation.
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