Abstract
Five species of rotifer (Brachionus lyratus, Conochilus dossuaris, Keratella cochlearis, Keratella quadrata and Trichotria tetractis) ingested bacteria at a prey density of 5-7 × 109 cells L.-1, and a sixth (Keratella procurva) did so at a higher bacterial concentration of 4 × 1010 cells L-1. Gastropus minor, Polyarthra vulgaris, Synchaeta pectinata and Trichocerca similis were not bacteriovores. Fluorescent-stained (DATF or acridine orange) bacteria were not suitable for determining which rotifers were potential grazers. However, bacteriovory was detected easily with safranin-red or methylene-blue stained bacteria. Clearance rates for the zooplankton community larger than 51�pm, determined with 3H-thymidine labelled bacteria, varied from <0.1-71 mL L-1. H-1, but were usually <5 mL L-1 h-1. Significant grazing was detected in >200�m, 90-200�m and 51-90�m fractions: it was impossible to ascribe bacteriovory to discrete taxonomic groups, because zooplankton taxa were not completely separated by these mesh sizes.
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