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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 10 | PAGES 1989-1995 | 1998
© Oxford University Press

research-article

Effect of large- and of small-bodied zooplankton on phytoplankton in a eutrophic oxbow

Istvaán Grigorszky, Saándor Nagy1, Albert Toóth1, Csaba Maátheé, Zoltaán Muüller1 and Gyoörgy Borbeély

Department of Botany, PO Box 14, L. Kossuth University H-4010 Debrecen, Hungary 1Department of Ecology, PO Box 71, L. Kossuth University H-4010 Debrecen, Hungary

Received on January 23, 1998; accepted on June 8, 1998 Macrozooplankton and microzooplankton effects on the phytoplankton were measured in situ in a eutrophic lake. Indigenous phytoplankton were incubated for 5 days in 301 mesocosms with either the macro- and microzooplankton (complete), microzooplankton only (micro) or no zooplankton (none). Changes in phytoplankton biovolume were investigated. Rotifer densities became significantly higher in the ‘micro’ treatment than in the ‘complete’ and ‘none’ treatments. Total algal biovolume changed little in the ‘complete’ and ‘none’ treatments, but increased significantly in the ‘micro’ treatment. The results suggest that macrozooplankton (Daphnia magna) suppressed it and microzooplankton (Keratella cochlearis) enhanced it. They had opposite net effects on the phytoplankton. Suppression of microzooplankton by Daphnia probably had an indirect negative effect on the phytoplankton.


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