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Phosphorus dynamics following restoration measures in the Loosdrecht Lakes (The Netherlands)
Authors:Louis Van Liere  Ramesh D Gulati  Frederick G Wortelboer  Eddy H R R Lammens
Affiliation:(1) Limnological Institute, Rijksstraatweg 6, 3631 AC, The Netherlands;(2) National Institute of Public Health & Environmental Hygiene, P.O. Box 1, 3720 BA Bilthoven, The Netherlands;(3) Limnological Institute, De Akkers 47, 8536 VD Oosterzee, The Netherlands
Abstract:External phosphorus loads to three shallow lakes in the Netherlands were reduced by eliminating waste-water discharge and by dephosphorization of the supply water, with which water level is controlled. Concentrations of total-phosphorus and chlorophyll a were significantly reduced during 1980–1986 in L. Breukeleveen, but not in L. Vuntus and L. Loosdrecht. In 1983–1986 the phosphorus flow through several trophic levels was determined. Changes over these years were not significant. External input to the lakes still contributes substantially to the phosphorus input. Release from the sediments also contributed to the cycling of the phosphorus. Excretion by large crustacean zooplankters was important in phosphorus recycling, and delivered 20–30% of the daily phytoplankton phosphorus demand. A similar contribution is expected from fish. If one wants recovery of the lakes to be accelerated, additional measures are needed.
Keywords:lake restoration  phosphorus-dynamics  total-phosphorus  chlorophyll a
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