Selective feeding and grazing rates of oyster (Crassostrea virginica) larvae on natural phytoplankton assemblages |
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| Authors: | L W Fritz R A Lutz M A Foote C L van Dover J W Ewart |
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| Institution: | 1. Rutgers University Shellfish Research Laboratory, Post Office Box 587, 08349, Port Norris, New Jersey
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| Abstract: | Results of laboratory feeding experiments suggest that oyster (Crassostrea virginica) larvae select small phytoplanktonic organisms (<10 μm) over larger-celled forms from natural estuarine assemblages, but that little selection occurs within the small phytoplankton fraction. Laboratory-reared larvae grazed each of five small-celled phytoplankton groups enumerated (coccoids, centrate diatoms, pennate diatoms, dinoflagellates, and flagellates) at rates proportional to phytoplankton group densities in controls (no larvae added). Larval grazing rates (number of cells removed per larva per hour) were inversely proportional to both larval density and experimental duration. |
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