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

Ooms-Wilms, A.L. and Postema, G. and Gulati, R.D. (1995) Evaluation of Bacterivory of Rotifera Based on Measurements of in-Situ Ingestion of Fluorescent Particles, Including Some Comparisons with Cladocera. Journal of Plankton Research, 17, 1057-1077. ISSN 0142-7873.

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Official URL: http://dx.doi.org/10.1093/plankt/17.5.1057

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]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:12205
Deposited On:25 Nov 2011 01:00
Last Modified:31 Mar 2014 10:10

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