1. Geography Research Unit; University of Oulu; Oulu Finland
2. Monitoring and Assessment Unit; Freshwater Centre; Finnish Environment Institute; Oulu Finland
3. Department of Aquatic Sciences and Assessment; Swedish University of Agricultural Sciences (SLU); Uppsala Sweden
4. Department of Wildlife, Fish and Environmental Studies; Swedish University of Agricultural Sciences (SLU); Umeå Sweden
5. Natural Resources Research Institute; University of Minnesota Duluth; Duluth MN U.S.A
6. Illinois Natural History Survey; Prairie Research Institute; University of Illinois; Champaign IL U.S.A
7. Natural Environment Centre; Biodiversity; Finnish Environment Institute; Oulu Finland