Selective ingestion of phytoplankton by the bivalvesMytilus edulis L. andCerastoderma edule (L.) |
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Authors: | T. C. Prins A. C. Smaal A. J. Pouwer |
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Affiliation: | (1) Present address: Delta Institute for Hydrobiological Research, Vierstraat 28, 4401 EA Yerseke, The Netherlands;(2) Present address: Tidal Waters Division, Ministry of Transport and Public Works, P.O. Box 8039, 4330 EA Middelburg, The Netherlands |
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Abstract: | Blue mussles (Mytilus edulis) and cockles (Cerastoderma edule) were collected in the Oosterschelde estuary (SW Netherlands) and exposed to diets consisting of the diatomPhaeodactylum tricornutum and silt. Algal concentrations were kept constant (20.103 cells.ml–1), and silt concentrations were varied between 3–80 mg.l–1 (mussel experiments) and 20–120 mg.l–1 (cockle experiments). Chlorophyll-a concentrations in the pseudofaeces were reduced compared to the diets, indicating selective ingestion of the algae. It was estimated that the mussels increase the ingestion of chlorophyll-a 2.0 times, and the cockles increase the chlorophyll-a ingestion 2.8 times, compared to the ingestion rate without selection. The selection coefficients were not affected by the SPM concentrations used. Phaeophytin-a concentrations in the faeces showed an increase as a consequence of the digestion of the ingested algae. Digestive efficiencies of chlorophyll-a varied between 36–92% The digestive efficiencies decreased with increasing SPM concentrations.Communication no. 541 of the Delta Institute for Hydrobiological Research. |
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Keywords: | bivalves Phaeodactylum tricornutum silt selective ingestion (pseudo)faeces Oosterschelde estuary |
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