Materials for the helminth fauna of the marsh frog Pelophylax ridibundus (Pallas, 1771) in Samara

The results of researches of species composition and structure of helminthes fauna of marsh frog Pelophylax ridibundus (Pallas, 1771) in Samara. In the period 2009-2013 biennium method full autopsy studied 106 amphibians of three populations. Found 19 species of helminths: Trematoda (15) and Nematoda (4). Dominated by a mature stage (marita) trematodes; nematodes and larval stages of helminths - are less common. Composition of helminths is typical for Central Russia, small and varies in different populations of the host. With increasing degree of anthropogenic stress (multi-level building) on biotope notes: 1) reduced species diversity of helminths; 2) decrease of infestation many kinds of worms; 3) reduce the number of background species of helminths; 4) changing structure of helminth community in the direction of simplification.