1. Department of Biology, Section of Animal Physiology; University of Turku; FI-20014 Turku Finland
2. Department of Zoology; University of British Columbia; 6270 University Blvd Vancouver BC V6T 1Z4 Canada
3. Fisheries and Oceans Canada; Pacific Biological Station; 3190 Hammond Bay Road Nanaimo British Columbia V9T 6N7 Canada
4. The Faculty of Land and Food Systems; University of British Columbia; 2357 Main Mall Vancouver BC V6T 1Z4 Canada