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

TY - JOUR

T1 - Evaluation of Bacterivory of Rotifera Based on Measurements of in-Situ Ingestion of Fluorescent Particles, Including Some Comparisons with Cladocera

AU - Ooms-Wilms, A.L.

AU - Postema, G.

AU - Gulati, R.D.

N1 - Reporting year: 1995 Metis note: 2052; CL; AFW ; AqE; file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1995\Ooms-Wilms_ea_2052.pdf

PY - 1995

Y1 - 1995

N2 - 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]

AB - 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]

U2 - 10.1093/plankt/17.5.1057

DO - 10.1093/plankt/17.5.1057

M3 - Article

VL - 17

SP - 1057

EP - 1077

JO - Journal of Plankton Research

JF - Journal of Plankton Research

SN - 0142-7873

IS - 5

ER -