1. Department of Geography, University of Toronto, Toronto, Ontario, Canada M5S 3G3
2. Contaminants Science Section, Institute of Ocean Sciences, Department of Fisheries and Oceans Canada, Sidney, British Columbia, Canada V8L 4B2
3. Chemical Ecology and Ecotoxicology, Department of Ecology, Lund University, Ecology Building, S-223 62 Lund, Sweden