The structure and function of fen lakes in relation to water table management in The Netherlands |
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Authors: | H. de Haan L. van Liere Sj. P. Klapwijk E. van Donk |
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Affiliation: | (1) Limnological Institute, Vijverhof Laboratory, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands;(2) National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA Bilthoven, The Netherlands;(3) Waterboard of Rijnland, P.O. Box 156, 2300 AD Leiden, The Netherlands;(4) Department of Nature Conservation, Agricultural University Wageningen, P.O. Box 8080, 6700 DD Wageningen, The Netherlands |
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Abstract: | Most relatively large (> 250 ha) and shallow (< 2 m), Dutch lakes originate from large-scale peat mining. Originally, their water tables were regulated by natural processes such as evapotransporation, precipitation, drainage and seepage (up and downwards). These lakes used to be oligo to mesotrophic, and the phytoplankton consisted mainly of diatoms and green algae. However, 30 years ago filamentous cyanobacteria were also present. Owing to the intensification of agriculture in the surroundings of the lakes, their management developed more and more towards a man-made reservoir function. This management resulted in inflow of eutrophic water from the agricultural areas in winter. In summer the lakes were increasingly used as a water supply. This supply is compensated by water imported mainly from the River Rhine. The impacts of this reservoir function on the limnology of the Dutch fen lakes are discussed with the Tjeukemeer, the Loosdrechtse Plassen and the Reeuwijkse Plassen as examples. All these lakes have become typical eutrophic waters with high turbidity, dominance of filamentous cyanobacteria and bream and complete loss of submerged macrophytes. Finally, methods and results of manipulation procedures to restore these waters are discussed. |
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Keywords: | fen lakes hydrology eutrophication productivity element cycling recovery |
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