Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Ecophysiology,Section Aquatic Animal Ecology, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;
Team Freshwater Ecology, DLO-Alterra, P.O. Box 47, 6700 AA Wageningen, The Netherlands;
Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Ecophysiology,Section Aquatic Animal Ecology, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;
Netherlands Centre for Biodiversity Naturalis, P.O. Box 9517, 2300 RA Leiden, The Netherlands;
Waterfauna Hydrobiologisch Adviesbureau, Oostrandpark 30, 8212 AP Lelystad, The Netherlands;