Zooplankton structure in the Loosdrecht lakes in relation to trophic status and recent restoration measures |
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Authors: | R D Gulati |
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Institution: | (1) Limnological Institute, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands |
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Abstract: | A five-year zooplankton study (1982–86) on three shallow and highly eutrophic lakes in the Loosdrecht area (The Netherlands) did not reveal any significant changes following the considerable reduction in external P-loading (from about 1.0 g to 0.3 g P m–2 year–1) since mid-1984.The recent annual fluctuations in the rotifer and crustacean densities are within the range of those found before the restoration measure became operative. A decrease in the average size of the crustaceans and an absence of large-bodied forms reflects an increased fish predation rather than a change in the quality or quantity of their sestonic food ( < 150 µm) which continues to be dominated by filamentous cyanobacteria and Prochlorothrix hollandica, a prochlorophyte discovered in these lakes recently. |
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Keywords: | zooplankton structure eutrophication restoration P-loading rotifers crustacea |
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