1. Museum of Natural History and Archaeology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
2. Bergen Museum, University of Bergen, PO Box 7800, NO-5020 Bergen, Norway
3. Norwegian Institute for Water Research, Southern Branch, Televeien 3, NO-4879 Grimstad, Norway
4. Akvaplan-Niva AS, Polar Environmental Centre, NO-9295 Tromsø, Norway