1. Patuxent Wildlife
Research Center, U.S. Geological Survey, Beltsville, Maryland 20705, United States
2. Environment Canada,
Pacific Wildlife Research Centre, Delta, British Columbia V4K 3N2, Canada
3. Natural Environment Research Council, Centre for Ecology & Hydrology, LEC, Lancaster, LA1 4AP, United Kingdom
4. Wageningen University, Division of Toxicology, Box 8000, NL6700 EA Wageningen, The Netherlands