Evaluation of Bacterivory of Rotifera Based on Measurements of in-Situ Ingestion of Fluorescent Particles, Including Some Comparisons with Cladocera

A.L. Ooms-Wilms, G. Postema, R.D. Gulati

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    Abstract

    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 mu m 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 mu m 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) and Anuraeopsis fissa (June-September). According to the uptake of fluorescently labelled bacteria, Conochilus unicornis had the highest uptake in June and A. fissa in July. [KEYWORDS: Fresh-water zooplankton; clearance rates; crustacean zooplankton; planktonic community; seasonal patterns; labeled bacteria; loosdrecht lakes; filtration-rates; natural bacteria; filtering rates]
    Original languageEnglish
    Pages (from-to)1057-1077
    JournalJournal of Plankton Research
    Volume17
    Issue number5
    DOIs
    Publication statusPublished - 1995

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