1. Norwegian Institute for Nature Research; Arctic Ecology Department; High North Research Centre on Climate and the Environment (FRAM) Tromsø Norway
2. Norwegian Institute for Nature Research; Trondheim; Norway
3. Norwegian Institute for Air Research; High North Research Centre on Climate and the Environment (FRAM); Tromsø Norway
4. Akvaplan-niva; High North Research Centre on Climate and the Environment (FRAM); Tromsø Norway
5. Department of Biology; Faculty of Science and Technology; Norwegian University of Science and Technology; Trondheim Norway
6. Centre d'Etudes Biologiques de Chizé; Centre National de la Recherche Scientifique; Villiers en Bois Deux-Sevres France
7. Norwegian Polar Institute; High North Research Centre on Climate and the Environment (FRAM); Tromsø Norway