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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 5 | PAGES 1057-1077 | 1995
© Oxford University Press

research-article

Evaluation of bacterivory of Rotifera based on measurements of in situ ingestion of fluorescent particles, including some comparisons with Cladocera

A.L. Ooms-Wilms1,2, G. Postema and R.D. Gulati

Netherlands Institute of Ecology, Centre for Limnology Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands 1Present address: Province of North-Holland, Department for Environment and Water PO Box 3088, 2001 DB Haarlem, The Netherlands 22 address: Netherlands Institute of Ecology, Centre for Limnology Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands

Received on October 21, 1994; accepted on January 11, 1994 Bacterivory of pelagic rotifers and cladocerans in eutrophic Lake Loosdrecht (The Netherlands) was determined by microscopic observation of in situ tracer particle uptake. Ingestion rates of rotifer species using 0.51 µm microspheres or fluorescently labelled bacteria as tracers differed, with one exception. The ingestion rates depended on both the species and the tracer type. For cladocerans, fluorescently labelled bacteria seemed to underestimate grazing, presumably due to rapid digestion of tracer cells. Comparing results obtained with 0.51 µm microspheres, rotifers were much more important grazers on bacteria than cladocerans in the study period (April-September). Based on microspheres, the rotifer populations with the highest uptake of bacteria were Filinia longiseta (May-July) andAnuraeopsis fissa (June-September). According to the uptake of fluorescently labelled bacteria, Conochilus unicornis had the highest uptake in June and A.fissa in July.


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