The Impact of Dreissena polymorpha (Pallas) Invasion on Unionid Bivalves

摘要: Dreissena polymorpha, the zebra mussel, is one of most aggressive and important invading aquatic species world wide. Its spread has followed path human activity, initially following constructed canals connecting Black Sea Baltic basins. One consequence this invasion impact mussels on native bivalves. Overgrowth by can cause a dramatic decrease in unionid density. The extent effect determined several factors including density, time since Dreissena, biomass attached type bottom sediments (sand versus silt). We found correlation between overall density number per overgrown unionid, ratio mass to host unionid. extensive overgrowth unionids resulting mortality, characteristic periods rapid population growth, when invade new waterbody.