caa a22 4500 465825559 CHVBK 20180323112148.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02256746 doi (NATIONALLICENCE)springer-10.1007/BF02256746 Impact of eutrophication on the silicate cycle of man-made basins in the Rhine delta [Elektronische Daten] [W. Admiraal, J. van der Vlugt] The impact of eutrophication on the biogeochemical cycle of silicate in the Rhine delta was analysed by 1) comparing the seasonal variation in river water, stagnant fresh water and coastal seawater and 2) observations in well-controlled experimental reservois subjected to different regimes of phosphate precipitation. The high input of dissolved sliciate from Rhine water was rapidly depleted in receiving waater systems through vigorous phytoplankton (datom) growth. In reservoirsca. 50% of the silicate input was retained over a seven years' observation period. Regeneration of silicate immobilized by diatoms was accelerated by very dense blooms of phytoplankton in reservoirs and in Lake IJssel that increased the pH value over 9. The prevailling lowratios of Si/N and Si/P in Rhine water entall the risk of massive blooms of flagellates or cyanobacteria in receiving waters. The 50% reduction in nitrogen and phosphate emission agreed upon in the Rhine Action Plan may reduce butnot eliminate this risk. Netherlands Hydrobiological Society, 1990 Eutrophication nationallicence silicate budget nationallicence silicate regeneration nationallicence nutrient rations nationallicence biogeochemical cycles nationallicence Admiraal W. National Institute to Public Health and Environmental Protection, P.O. Box 1, 37290 BA, Bitthoven, The Netherlands aut van der Vlugt J. National Institute to Public Health and Environmental Protection, P.O. Box 1, 37290 BA, Bitthoven, The Netherlands aut Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 23-36 0165-1404 24:1<23 1990 24 10452 https://doi.org/10.1007/BF02256746 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02256746 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Admiraal W. National Institute to Public Health and Environmental Protection, P.O. Box 1, 37290 BA, Bitthoven, The Netherlands aut NATIONALLICENCE 700 1- van der Vlugt J. National Institute to Public Health and Environmental Protection, P.O. Box 1, 37290 BA, Bitthoven, The Netherlands aut NATIONALLICENCE 773 0- Hydrobiological Bulletin Kluwer Academic Publishers 24/1(1990-07-01), 23-36 0165-1404 24:1<23 1990 24 10452 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer