1. Department of Earth Sciences─Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
2. Baltic Sea Centre, Stockholm University, SE-106 91 Stockholm, Sweden
3. Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, 6525 AJ Nijmegen, The Netherlands
4. Institute for Marine and Atmospheric Research Utrecht, Utrecht University, 3584 CC Utrecht, The Netherlands
5. Department of Aquatic Ecology and Environmental Biology, Radboud Institute for Biological and Environmental Sciences, Radboud University, 6525 AJ Nijmegen, The Netherlands
6. Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden