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

István Grigorszky, Sándor Nagy, Albert Tóth, Csaba Máthé, Zoltán Müller, György Borbély

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1989-1995
Number of pages7
JournalJournal of Plankton Research
Volume20
Issue number10
DOIs
Publication statusPublished - Oct 1998

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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