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Journal of Plankton Research Vol.24 no.1 pp.25-31, 2002
© Oxford University Press 2002

Effects of Brachionus calyciflorus and Brachionus rubens on a manipulated freshwater microbial community

Silvia Mohr and Rita Adrian

Institute Of Freshwater Ecology And Inland Fisheries, MÜGgelseedamm 301, 12587 Berlin, Germany

S. mohr. email: silvia.mohr{at}uba.de.

In situ grazing experiments were conducted in a highly eutrophic lake during May and June 1998 to examine species-specific predatory effects of the closely related rotifers Brachionus calyciflorus and Brachionus rubens on the microbial community (<56 µm lake fraction). From functional response experiments with ciliates we know that B. calyciflorus feeds more efficiently on large ciliate prey such as Coleps sp. than does B. rubens. To test these different food-size preferences under natural conditions we manipulated the natural microbial community by adding the ciliate Coleps sp. in thepresence and absence of B. calyciflorus and B. rubens. Both brachionids had a considerable predatory impact on the microbial community of Lake Müggelsee. Brachionus calyciflorus had strong negative effects on large ciliates like Coleps sp., large heterotrophic nanoflagellates, and large autotrophic flagellates while B. rubens generally preferred the smaller size classes. Bacteria abundances and chlorophyll a concentrations generally remained unaffected. The different predatory impacts of the two rotifer species on the close to natural food conditions match results from previous single-species functional response experiments. Thus, the nature of predatory effects of brachionids in the field are probably predictable from laboratory experiments.


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