1. Department of Ecology Swedish University of Agricultural Sciences Uppsala Sweden
2. Department of Aquatic Resources Swedish University of Agricultural Sciences Drottningholm Sweden
3. SLU Swedish Species Information Centre Swedish University of Agricultural Sciences Uppsala Sweden
4. AquaBiota Water Research Stockholm Sweden
5. MIX Research Sweden Uppsala Sweden
6. Limnordic AB Örnsköldsvik Sweden
7. Mammal Research Institute Polish Academy of Sciences Białowieża Poland