1. UiT The Arctic University of Norway , Hansine Hansens veg 18, 9019 Tromsø , Norway
2. Centre for applied research, Norwegian School of Economics , Helleveien 30, 5045 Bergen , Norway
3. Socio-Economic Marine Research Unit , Whitaker Institute, University of Galway , Ireland
4. Economics for the Environment Consultancy , 10F Printing House Yard, London E2 7PR , UK