1. Aquatic
Ecology and Water Quality Management Group, Wageningen University, P.O Box 47, 6700 AA, Wageningen, The Netherlands
2. Laboratory
of Microbiology, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, The Netherlands
3. IMARES, Institute for Marine Resources & Ecosystem Studies, Wageningen UR, P.O. Box 68, 1970 AB IJmuiden, The Netherlands