TREMATODES OF GASTROPODS OF KYIV RESERVOIR

Abstract

Our study aimed to examine the current state of trematodes diversity in Kyiv reservoir. The molluscs under analysis belong to the species living for more than two years. The presence of trematode invasion in molluscs indicates the permanent or periodic presence of infected vertebrate hosts in area. Low mobility of the molluscs contributes to specification of the specific reservoir section visited by the definitive hosts. The species composition and quantitative indicators of invasion of the larval stages (cercariae) of trematodes (Digenea) in six species of Gastropoda in the Dnieper area of the upper site of Kyiv reservoir were studied. In total up to 490 specimens of Gastropoda belonging to subclasses Pulmonata (Lymnaea stagnalis Linnaeus, 1758, Planorbarius corneus Linnaeus, 1758, Stagnicola palustris Muller, 1774) and Prosobranchia (Fagotia acicularis Férussac, 1823, Viviparus viviparus Linnaeus, 1758, Bithynia tentaculata Linnaeus, 1758) were examined. The largest number of trematodes species was found in molluscs L. stagnalis (Lymnaeidae) and B. tentaculata (Bithyniidae) which amounted to seven and three species accordingly. The highest abundance, 150 and upper per mollusc specimen, were Diplostomum spathaceum (Rudolphi, 1819) and Tylodelphys conifer (Mehlis, 1846). Three species of trematodes were recorded in B. tentaculata − Cercaria lophocerca Filippi, 1857, Pleurogenoides medians (Olsson, 1876), Palaeorchis incognitus Szidat, 1943 with an average abundance upper 280 and prevalence 8−17%. Basically, the definitive hosts of the detected species of trematodes are fish, amphibians and waterfowl. Detected cercariae of trematodes D. spathaceum, Sanguinicola intermedia Ejsmont, 1925, Metagonimus yokogawai (Katsurada, 1912), Echinostoma revolutum (Fröhlich, 1802), Echinoparyphium recurvatum (Linstow, 1873) may cause diseases and sometimes death of fish and waterfowl. Some species may be used in medicine.