Influence on phytoplankton biomass in lakes of different trophy by phosphorus in lake water and its regeneration by zooplankton |
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Authors: | Jolanta Ejsmont-Karabin Irena Spodniewska |
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Affiliation: | (1) Polish Academy of Sciences, Institute of Ecology, Hydrobiological Station, ul. Lena 13, 11-730 Mikolajki, Poland;(2) ul. Darwina 18 m 118, 03-488 Warsaw, Poland |
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Abstract: | In 49 unpolluted lakes of north-eastern Poland the biomass of algae in summer is significantly related to the concentration of total phosphorus and to the rate of phosphorus regeneration by zooplankton. Using a model with equations describing these relationships, the biomass of blue-green algae and other phytoplankton groups was predicted for 14 polluted lakes. A good approximation of actual values was obtained only for the biomass of blue-green algae calculated from the estimated rate of P regeneration by zooplankton in these lakes. It is hypothesized that more-or-less edible algae of other classes did not show dependence on the rate of input of regenerated P because their biomass was heavily reduced by grazing of zooplankton. |
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Keywords: | lakes eutrophication phosphorus regeneration phosphorus concentration zooplankton phytoplankton |
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