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The role of nitrogen as a growth limiting factor in the eutrophic Lake Vesijärvi, southern Finland

  • J. Kanninen
  • Lea Kauppi
  • E.-R. Yrjänä
Conference paper
Part of the Developments in Hydrobiology 7 book series (DIHY, volume 7)

Abstract

The significance of nitrogen for algal growth was studied in Lake Vesijärvi in 1979 and 1980 by algal bioassay, using Selenastrum capricornutum and Anabaena cylindrica as test organisms. Nitrogen limited the growth of Selenastrum for the major part of the investigation period, while phosphorus seemed to be the most limiting factor for Anabaena. This difference was reflected in the in situ succession of phytoplankton. As the ratio of inorganic nitrogen to phosphate phosphorus became smaller, nitrogen-fixing blue-green algae became dominant. Nitrogen fixation was greatest at the beginning of July, coinciding with maximum heterocyst numbers.

Keywords

bioassay nitrogen nitrogen fixation 

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Copyright information

© Dr W. Junk Publishers, The Hague 1982

Authors and Affiliations

  • J. Kanninen
    • 1
  • Lea Kauppi
    • 1
  • E.-R. Yrjänä
    • 1
  1. 1.National Board of WaterWater Research InstituteHelsinki 10Finland

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