![]() The density of the most abundant calanoid copepod Eurytemora affinis increased in the presence of dreissenids, probably as an indirect food web response. ![]() polymorpha) mussels in 3500-L, 80-mum mesh enclosures placed in a slackwater area of the St Lawrence River. Our 12-day experiment consisted of controls (no mussels) and treatments with unionid (Elliptio complanata), quagga (Dreissena bugensis) or zebra (D. ![]() Is benthic planktivory important in this river? Has this linkage been altered substantially by dreissenids? Do the two dreissenid species differ in planktivory, and is this ecologically important if quagga mussels extend their geographical range? 3. We conducted an experiment comparing zooplanktivory by one unionid and two dreissenid species that addressed several primary questions. Suspension feeding by bivalves exceeds that by other planktivores in many North American rivers, and food webs may be altered substantially by differences in feeding patterns between native unionid mussels and invading dreissenid mussels.
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