1. Department of Natural Resource Sciences, McGill University, Sainte-Anne-de-Bellevue, QC H9X 3V9, Canada
2. Greenland Climate Research Centre, Greenland Institute of Natural Resources, PO Box 570, Nuuk 3900, Greenland
3. Department of Environmental Research and Monitoring, Swedish Museum of Natural History, 10405 Stockholm, Sweden
4. Department of Ecoscience, Arctic Research Centre, Aarhus University, Frederiksborgvej 399, Roskilde 4000, Denmark
5. Department of Biology, Université Laval, Québec City, QC G1V 0A6, Canada
6. Department of Birds and Mammals, Greenland Institute of Natural Resources, PO Box 570, Nuuk, 3900, Greenland