1. Department of Biology Acadia University Wolfville Nova Scotia B4P 2R6 Canada
2. Environment and Climate Change Canada, Wildlife Research Division 6 Bruce Street Mount Pearl Newfoundland and Labrador A1N 4T3 Canada
3. Fisheries and Oceans Canada, Ontario and Prairie Region 501 University Crescent Winnipeg Manitoba R3T 2N6 Canada
4. Fisheries and Oceans Canada, Arctic Region 501 University Crescent Winnipeg Manitoba R3T 2N6 Canada
5. Environment and Climate Change Canada, Ecotoxicology and Wildlife Health Division, Raven Road Carleton University Ottawa Ontario K1A 0H3 Canada