1. Institute of Bioscience; Aarhus University; 4000 Roskilde; Denmark
2. Baltic Nest Institute; Stockholm Resilience Centre; Stockholm University; 10691 Stockholm; Sweden
3. Environmental and Marine Biology; Department of Biosciences; Åbo Akademi University; 20520 Åbo; Finland
4. Department of Earth Sciences (Geochemistry); Faculty of Geosciences; Utrecht University; 3508 CD Utrecht; The Netherlands
5. GeoBiosphere Science Centre; Department of Earth and Environmental Science; Lund University; 22362 Lund; Sweden