1. Environment Canada, Aquatic Ecosystem Protection Research Division, Burlington ON L7R 4A6, Environment Canada, Aquatic Ecosystem Protection Research Division, SaskatoonSK S7N 3H5, Canadian Circumpolar Institute, University of Alberta, Edmonton, AB T6G 2R3, Austrian Academy of Sciences, Dr. Ignaz Seipel-Platz 2, A-1010 Vienna, Austria, Department of Geography, Queen’s University, Kingston ON K7L 3N6, Centre d’Etudes Nordiques, Université Laval, Québec Qc G1 V 0A6, Department of Biology, Queen’s University...