Unionid clams and the zebra mussels on their shells (Bivalvia: Unionidae, Dreissenidae) as hosts for trematodes in lakes of the Polish lowland

摘要: The aim of this work was to determine the diversity and prevalence trematodes from subclasses Digenea Aspidogastrea in native unionid clams (Unionidae) dreissenid mussels (Dreissenidae) residing on surface their shells. 914 individuals unionids 4,029 Dreissena polymorpha were collected 2014 11 lakes Polish Lowland. total percentage infected Unionidae Dreissenidae 2.5% 2.6%, respectively. In unionids, we found three species trematodes: Rhipidocotyle campanula (Digenea: Bucephalidae), Phyllodistomum sp. Gorgoderidae) Aspigdogaster conchicola (Aspidogastrea: Aspidogastridae). Their proportion pool 60.9%, 4.4% 13.0%, We also pre-patent invasions (sporocysts undeveloped cercariae, 13.0%) echinostome metacercariae (8.7%) Echinostomatidae). majority invaded by (98.1%) only a few cases observed (bucephalid sporocysts, 1.9%). results indicate that most played role first intermediate hosts for digenetic or final aspidogastrean trematodes, while dreissenids mainly second hosts. key words: Unionidae, polymorpha, Digenea, Aspidogastrea, Rhipidocotyle, Phyllodistomum, Aspidogaster, prevalence, Poland