Long-term compositional response of phytoplankton in a shallow, turbid environment, Neusiedlersee (Austria/Hungary)

M. T. Dokulil, J. Padisák

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Data on phytoplankton biomass and on nutrient concentrations from Neusiedler See (mean depth 1.3 m) covering more than two decades are presented. The lake underwent strong eutrophication during this period. The response of annual average phytoplankton biomass and chlorophyll-a to the increase of phosphorus concentration from 10 to > 100 μg l-1 was moderate (7-fold increase). This is caused by light limitation of the system because of the high inorganic turbidity of the lake. Analyses of the spring, summer and autumn seasons at the generic and higher taxonomic levels show significant changes in composition of the phytoplankton community. Diatoms were more important during the pre-eutrophication phase while Chlorophyceae became most prominent during the peak of the eutrophication process. Blue-green algae, including Microcystis, became more apparent after this period. The abundance of some groups or genera, e.g. Euglena, was linked to the decline and re-appearance of submerged macrophytes in the lake. Abiotic and biotic interactions as causes for the observed changes are discussed.

Original languageEnglish
Pages (from-to)125-137
Number of pages13
JournalHydrobiologia
Volume275-276
Issue number1
DOIs
Publication statusPublished - Feb 1 1994

Keywords

  • competition
  • eutrophication
  • long-term response
  • phytoplankton dynamics
  • shallow lake
  • taxonomic response

ASJC Scopus subject areas

  • Aquatic Science

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