Affiliation: | a Centre for Marine Biodiversity, Bedford Institute of Oceanography 1 Challenger Drive, PO Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2 b Institute of Marine Research PO Box 1870 Nordnes, N-5817 Bergen, Norway c Adaptive Dynamics Network, International Institute for Applied Systems Analysis A-2361 Laxenburg, Austria d Danish Institute for Fisheries Research, Department of Inland Fisheries Vejlsøvej 39, DK-8600 Silkeborg, Denmark |