1. Norwegian Institute for Water Research, Gaustadalléen 21, N-0349 Oslo, Norway
2. Norwegian Institute for Nature Research, Gaustadalléen 21, N-0349 Oslo, Norway
3. Department of Botany, NHM, University of Oslo, PO Box 1172 Blindern, N-0318 Oslo, Norway
4. Geological Survey of Norway, N-7491 Trondheim, Norway
5. Electromagnetic Geoservices (EMGS), Stiklestadveien 1, N-7041 Trondheim, Norway
6. AquaBiota Water Research, Svante Arrhenius väg 21A, SE-10405 Stockholm, Sweden
7. Norwegian Meteorological Institute, Gaustadalléen 21, N-0349 Oslo, Norway