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Dreissena polymorpha (Pallas, 1771) is an alien bivalve species that has successfully spread in lotic and lentic water habitats of Poland. The aim of the study was an assessment of differences in the level of colonisation of zebra mussel individuals residing on the shell surface of Unionidae gathered from the shore zone of water bodies both between Unionidae species and the two lakes of central Poland that were sampled. The lakes are surrounded by forest, and have silty-sandy bottoms that are poor in hard surfaces, but these water bodies vary in size and wave exposure. Specimens of two Unionidae species, Anodonta anatina (Linnaeus, 1758) and Unio tumidus Philipsson, 1788, were collected from both lakes and numbers of colonizing D. polymorpha individuals fixed to their shells noted. The majority of collected unionids were inhabited by D. polymorpha. Our results suggest that Unionidae living in the smaller lake were more exposed to colonisation by D. polymorpha, and that A. anatina in both lakes was more likely to be used as a substrate for D. polymorpha colonies than U. tumidus. key words: zebra mussel, Anodonta anatina, Unio tumidus, shell size, littoral zone

Infestation of unionids native to Poland by Dreissena polymorpha (Pallas, 1771) in littoral zone of two lowland lakes