Gastropod communities of the reservoirs and the rivers of the Ciechanowska Upland = Сообщества Gastropodа в водохранилишах и реках Цехановского Нагорья.
ВІСНИК Житомирського державного університету імені Івана Франка (10).
The aims of research were: analysis of the number of species, density, domination, constancy and commonness of the gastropod communities in the water environments of the Ciechanowska Upland (northeastern part of Po-land), analysis of biodiversity of the snail communities and similarity among them, research on the relationship among freshwater snail communities and the certain environmental factor, research on usefulness of snail communities as a factor of water quality. Four rivers: the Lydynia, the Pelta, the Sona, the Wkra, 4 old beds of the Wkra river and 9 anthropogenic reservoirs (clay-pits) were researched. The zoocenology analysis of snail com-munities was carried out using dominancy, constancy, commonness indices and biodiversity indices: Simpson Diversity Index (D), Shannon-Wiener Diversity Index (H'), Evennes Index (J’). 27 gastropod species are presented in the rivers of the Ciechanowska Upland. The first permanent population of Ferrissia wautieri (Mirolli) in Poland has been recorded from the clay-pit. Gastropods in running waters can be biological indicators of oxygen level of water. If the level of oxygen increases, the number of species will increase. Viviparus viviparus (L.) and Radix peregra (O.F. Mull) can be indicators of anthropopressure.
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