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

Grigorszky, István and Nagy, Sándor Alex and Tóth, Albert and Csaba, Máthé and Müller, Zoltán and Borbély, György (2005) Effect of large- and small- bodied zooplankton on phytoplankton in a eutrophic oxbow. Journal of Plankton Research, 20 (10). pp. 1989-1995. ISSN 0142-7873 (print), 1464-3774 (online)

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Abstract

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.

Item Type: Article
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE08 Hydrosphere. Hydrology / hidroszféra, hidrológia
Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia
Depositing User: Erika Bilicsi
Date Deposited: 07 Dec 2012 10:02
Last Modified: 07 Dec 2012 10:02
URI: http://real.mtak.hu/id/eprint/3501

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