1. Groningen Institute for Evolutionary Life Sciences; University of Groningen; Nijenborgh 7 9747 AG Groningen The Netherlands
2. HAS Den Bosch; University of Applied Sciences; Onderwijsboulevard 221 5223 DE 's-Hertogenbosch The Netherlands
3. Altenburg and Wymenga Ecological Consultants; Suderwei 2 9269 TZ Feanwâlden The Netherlands
4. Aquatic Ecology & Environmental Biology Group; Institute for Water and Wetland Research at the Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands
5. NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems; Utrecht University; PO Box 59, 1790 AB Den Burg Texel The Netherlands
6. Department of Aquatic Resources (SLU Aqua); Swedish University of Agricultural Sciences; Stångholmsvägen 2 SE-178 93 Drottningholm Sweden