1. College of Earth, Ocean and Atmospheric Sciences; Oregon State University; Corvallis OR 97330 USA
2. Institute of Marine Research; Flødevigen; His N-4817 Norway
3. Centre for Ecological and Evolutionary Synthesis (CEES); Department of Biology; University of Oslo; P.O. Box 1066 Blindern Oslo N-0316 Norway
4. University of Agder; 4604 Kristiansand Norway