1. Centre for Coastal Research University of Agder Kristiansand 4604 Norway
2. Institute of Marine Research Flødevigen Research Station His 4817 Norway
3. NORCE Norwegian Research Centre Laboratory for Freshwater Ecology and Inland Fisheries (LFI) Kristiansand Norway
4. Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin 12587 Germany
5. Humbold‐Universität zu Berlin Berlin 10117 Germany
6. Norwegian Institute for Water Research Jon Lilletuns vei 3 Grimstad Norway