1. Centre d'Etudes Biologiques de Chizé; UMR 7372-Centre National de la Recherche Scientifique, Université de La Rochelle; Villiers-en-Bois France
2. Littoral Environnement et Sociétés; UMR 7266-Centre National de la Recherche Scientifique, Université de La Rochelle; La Rochelle France
3. Department of Biological Sciences; San Jose State University; San Jose California USA
4. Norwegian Institute for Air Research; Tromsø Norway
5. Norwegian Institute for Nature Research; Trondheim Norway
6. Norwegian Polar Research Institute; Tromsø Norway
7. Norwegian Institute for Nature Research; Tromsø Norway