1. European Commission; Joint Research Centre; Institute for Environment and Sustainability; Ispra Italy
2. Centre for Ecology & Hydrology (CEH); Bush Estate Penicuik EH26 0QB UK
3. CEDEX; C/Paseo Bajo de la Virgen del Puerto nº 3 28005 Madrid Spain
4. Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB); Justus-von-Liebig-Str. 7 D-12489 Berlin Germany
5. Environment Agency; Kings Meadow Road Reading Berkshire RG1 8DQ UK
6. Department of Tisza River Research; Balaton Limnological Research Institute; Klebelsberg Kuno U. 3 Tihany H-8237 Hungary
7. Norwegian Institute for Water Research (NIVA); Gaustadalléen 21 N-0349 Oslo Norway
8. Department of Biology; Ghent University; Research group Protistology and Aquatic Ecology; Krijgslaan 281-S8 B-9000 Ghent Belgium