Production of planktonic Rotatoria in Ormajärvi, an eutrophicated lake in southern Finland

  • Veli-Risto Cajander
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 14)


The production of planktonic rotifers was studied in eutrophic Lake Ormajärvi. Of the total annual production of rotifers (2.9 g org. C m-2 or 231 mg dry weight m-3) 49% was achieved during one month (July) and 88% during 3 months of summer. The most important producers were Keratella cochlearis (1.2 g C m-2), Asplanchna priodonta (0.8 g C m-2) and Conochilus unicornis (0.6 g C m -2). The P/B ratio for the total rotifer community during the growing season (7 months) was 25.0; monthly P/ B values varied between 0.3 and 5.2. The daily P/B values were highest among species of Collotheca. The relationships of rotifers to some biotic and abiotic factors (invertebrate predators — Mesocyclops, Cladocera, planktonic Protozoa and temperature) are briefly discussed.


rotifers zooplankton production Rotatoria P/B ratio eutrophication 


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Copyright information

© Dr W. Junk Publishers, The Hague 1983

Authors and Affiliations

  • Veli-Risto Cajander
    • 1
  1. 1.Department of Environmental ScienceUniversity of HelsinkiHelsinki 71Finland

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