1. Department of Environmental Science (ACES), Stockholm University, Svante Arrhenius väg 8, SE-11418 Stockholm, Sweden
2. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstr. 133, CH 8600 Dübendorf, Switzerland
3. Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092 Zürich, Switzerland
4. Department of Ecological Microbiology, University of Bayreuth, Bayreuth, Germany
5. Department Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
6. Geography Department, Humboldt University Berlin, Berlin, Germany
7. Technical University of Darmstadt, Institute of Applied Geosciences, Darmstadt, Germany
8. IWW Water Centre, Mülheim an der Ruhr, Germany
9. Julius Kühn-Institute, Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection, Berlin, Germany
10. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, U.K.
11. Institute of Microbiology, Leibniz University of Hannover, Herrenhäuser Str. 2, DE-30167 Hannover, Germany