Affiliation: | (1) Tidal Waters Division, Ministry of Transport and Public Works, P.O. Box 20907, NL-2500 EX The Hague, The Netherlands;(2) Corporate Research Laboratory, AKZO Research Laboratories Arnhem, P.O. Box 9300, NL-6800 SB Arnhem, The Netherlands;(3) Aquatic Ecology Department, University of Amsterdam, Kruislaan 320, NL-1098 SM Amsterdam, The Netherlands |