1. Environment Canada, National Water Research Institute, Burlington, Ontario, L7R 4A6 Canada, Departments of Arctic Environment and Environmental Chemistry, National Environmental Research Institute, Frederiksborgvej 399, DK-4000, Denmark, Department of Pharmacology and Toxicology, Norwegian College of Veterinary Medicine, N-0033 Oslo, Norway, Department of Environmental Sciences, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan, Norwegian Polar Institute, N-9296 Tromso, Norway, and Center...