Bithyniid Abundance in the South of Western Siberia Water-Courses and Water Reservoirs (Russia)

Gastropoda are an important component of the freshwater benthic communities Western Siberia and participate in a number trophic relationships as intermediate hosts trematodes. The purpose this study is defining ratio Bithyniidae mollusks between other gastropods with regard to species diversity, compile all information about abundance bithyniid snails that we examined over 27 years four major basins situated Novosibirsk region. Analyzing data diversity gastropod from ecosystems south Siberia, found 22% water bodies contained snails. In total, 201 samples were abundant reproductive age collected 34 localities 25 bodies. While these not most inspected reservoirs (fewer than 10 per square meter), two accommodated great (more 100 ind.·m−2). Bithyniid snail may vary tenfold different same body. This seasonal dynamics show decreased June August years. results can be used identify predict natural foci opisthorchiasis Siberia.