Abstract
The results of helminthological studies of the wintered water voles are given. This group of voles hosts 13 species of helminthes: 1, Trematoda, 7, Cestoda, and 5, Nematoda. The trematode Notocotilus noyeri Joyex, 1922 (88 ±2.7)% and the cestode Arvicolepis transfuga (Spassky et Merkusheva, 1967) (68.9 ± 3.8)% dominate among them in the extensiveness of invasion (EI). The factors are studied that determine the probability of the water voles being infected with the background species of helminthes. A relation of the long-term dynamics of the host population with the dynamics of the infection with the dominant species of the parasites is established.
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