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Grazing by rotifers and crustacean zooplankton on nanoplanktonic protists

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Abstract

Predation on nanoflagellates by metazoan zooplankton was investigated using a radioactively labeled flagellate, Poterioochromonas malhamensis, as a tracer cell in laboratory incubations of freshly collected plankton assemblages. Experiments conducted in the fall, winter and spring indicated that rotifers dominated the grazing on nanoflagellates by metazoans in the winter (68%) and spring (92%). Rotifer grazing was not determined in the autumn. It is likely that the greater impact of rotifer grazing in the spring was due to the occurrence of abundant filamentous cyanobacteria and gelatinous colonial phytoplankton which selectively depressed feeding rates of crustaceans compared to rotifers. Crustacean predation on nanoflagellates was highest in the autumn when cladocerans (primarily Daphnia spp.) were abundant. Predation by metazoan zooplankton in this lake appeared capable of removing the total standing stock of heterotrophic and phototrophic nanoplankton in < 1 d. Impacts of ciliated protozoa on nanoplankton, calculated from abundances and literature feeding rates, ranged from approximately one-third to four times that of metazoan predation depending on season and method of calculation. The relative importance of the different groups of predators appears to vary seasonally which is expected to alter the transfer of energy, carbon and nutrients from bacteria to higher trophic levels.

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Authors and Affiliations

  1. Academy of Natural Sciences of Philadelphia, 1900 Benjamin Franklin Parkway, 19103, Philadelphia, PA, USA

    Robert W. Sanders, Douglas A. Leeper, C. Harold King & Karen G. Porter

  2. Savannah River Ecology Laboratory, Drawer E, 29801, Aiken, SC, USA

    Douglas A. Leeper

  3. Division of Bacterial and Myotic Diseases, Centers for Disease Control, 30333, Atlanta, GA, USA

    C. Harold King

  4. University of Georgia, 30602, Athens, GA, USA

    Karen G. Porter

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  1. Robert W. Sanders
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  2. Douglas A. Leeper
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Sanders, R.W., Leeper, D.A., King, C.H. et al. Grazing by rotifers and crustacean zooplankton on nanoplanktonic protists. Hydrobiologia 288, 167–181 (1994). https://doi.org/10.1007/BF00006240

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