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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 11 | PAGES 1499-1512 | 1994
© Oxford University Press

research-article

Effects of Daphnia on microzooplankton communities

Jeffrey D. Jack1 and John J. Gilbert

Department of Biological Sciences, Dartmouth College Hanover, NH 03784, US

Received on February 5, 1994; accepted on July 1, 1994

Intact phytoplankton and microzooplankton communities from eutrophic Star Lake were incubated for 4 days with and without Daphnia pulex, Daphnia galeaia mendotae, or a natural assemblage of Daphnia species. They were sampled at the onset and termination of the experiment for bacterial, phytoplankton, ciliate, rotifer, copepod and cladoceran densities. The cladocerans had varied effects on the rotifers, ranging from significant suppression of most rotifer species (Keratella cochlearis, Polyarthra remata, Keratella crassa) in the D.pulex jars, to the suppression of one (K.crassa) or no species in the D.galeata mendotae and Star Lake Daphnia assemblage jars, respectively. Small ciliates (<30 µm, longest dimension), such as Strobilidium sp. and Pseudo-cyclidium sp., were adversely affected by most of the cladoceran treatments, while several larger ciliates (>81 µm) were unaffected in all such treatments. Ciliates were not consistently more vulnerable to cladoceran suppression than similarly sized rotifers. The suppression of ciliates and rotifers was attributable to both direct effects (predation, interference, or both) and indirect effects (e.g. resource competition) of the cladocerans.

1Present address: Department of Biology, University of Louisville, Louisville, KY 40292, USA


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