1. National Water Research Institute, Environment Canada, Burlington, Ontario L7R 4A6, Canada, Norwegian Polar Institute, Tromsø, NO-9296, Norway, Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9 Canada, Department of Arctic Environment, National Environmental Research Institute, Roskilde, DK-4000, Denmark, U.S. Fish and Wildlife Service, 1011 East Tudor Road, Anchorage, Alaska, 99503, Department of Environment and Natural Resources, Government of Nunavut, Iqaluit,...