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Problems in estimating phytoplankton nitrogen limitation in Shallow Eutrophic Lakes

  • Guntram Weithoff
  • Norbert Walz
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  • 348 Downloads
Part of the Developments in Hydrobiology book series (DIHY, volume 143)

Abstract

In three shallow eutrophic lakes, phytoplankton nutrient limitation was investigated. Special emphasis was laid on nitrogen limitation. Two different methods were applied: growth response after nutrient supply (enrichment response) and ammonium enhancement response. In two of the three lakes, nitrogen limitation occurred, but the two methods led to different results. The enrichment response was related to the ambient nitrogen concentrations whereas the ammonium enhancement response corresponded more closely with the phytoplankton C:N ratios. Thus, it is difficult to estimate nitrogen limitation in systems with rapid changing nutrient conditions.

Key words

growth bioassay dark carbon fixation mixing nutrient ratio 

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Guntram Weithoff
    • 1
  • Norbert Walz
    • 1
  1. 1.Dept. Limnology of Lowland Rivers and Shallow LakesInstitute of Freshwater Ecology and Inland FisheriesBerlinGermany

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