JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 3 | PAGES 391-397 | 1997
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How Daphnia cope with algae selected for inedibility in long- running microcosms
Department of Biology and NERC Centre for Population Biology, Imperial College Silwood Park, Ascot, Berks SL5 7PY, UK 1Present address: Äppelbo, Skottorpsäteri S-31205 Skottorp, Sweden
Received on June 29, 1996; accepted on October 14, 1996 Macro video records of restrained feeding Daphnia enabled us to measure simultaneously carapace gape, claw rejection rate, filter limb beat rate, and mandible movement rate. We compared the effects of high and low concentrations of highly edible algae and of inedible algae, the latter selected by long-term Daphnia grazing in oligotrophic microcosms. Inedible algae slowed the filtering process and influenced the carapace gape (widening at low concentration and narrowing at high), but did not affect the rejection rate.
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