1. Department of Arctic and Marine Biology, UiT─The Arctic University of Norway, N-9037 Tromsø, Norway
2. Fram Centre, Norwegian Polar Institute, N-9296 Tromsø, Norway
3. Fram Centre for Climate and the Environment, Fram Centre, Norwegian Institute for Air Research, N-9296 Tromsø, Norway
4. Norwegian Institute for Nature Research, Høgskoleringen, Trondheim 97034, Norway