[1] Univ Helsinki, Dept Econ & Management, POB 27, FI-00014 Helsinki, Finland
[2] Finnish Environm Inst SYKE, Ctr Sustainable Consumpt & Prod, POB 140,Mechelininkatu 34A, FI-00251 Helsinki, Finland
[3] Finnish Environm Inst SYKE, Biodivers Ctr, POB 140,Mechelininkatu 34A, FI-00251 Helsinki, Finland
[4] Finnish Environm Inst SYKE, Freshwater Ctr, Jyvaskyla Off, Survontie 9 A, FI-40500 Jyvaskyla, Finland
[5] Univ Eastern Finland, Dept Geog & Hist Studies, POB 111, FI-80101 Joensuu, Finland
[6] Finnish Environm Inst SYKE, Marine Res Ctr, POB 140,Mechelininkatu 34A, FI-00251 Helsinki, Finland