1. Dept. of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
2. Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, NS B2Y 4A2, Canada
3. Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John’s, NL A1A 5J7, Canada
4. Dept. of Ocean Sciences, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
5. Institute of Marine Research, Bergen 5817, Norway