1. Institute of Marine Research, PO Box 1870 Nordnes, N-5817, Bergen, Norway
2. Faculty of Biosciences and Aquaculture, University of Nordland, N-8049, Bodø, Norway
3. Institute of Marine Research, Section for Population Genetics and Ecology, Nordnesgaten 50, N-5817, Bergen, Norway
4. Institute of Marine Research, PO Box 6404, N-9294, Tromsø, Norway
5. University of Bergen, Department of Mathematics, Johannes Brunsgate 12, N-5008, Bergen, Norway
6. University of Bergen, The Centre for the Study of the Sciences and the Humanities, PO Box 7800, N-5020 Bergen, Norway