1. Department of Ecohydrology and Biogeochemistry, Leibniz Institute of Freshwater Ecology and Inland Fisheries , 12587 Berlin, Germany
2. Astrobiology Research Group, Zentrum für Astronomie und Astrophysik, Technische Universität Berlin , 10623 Berlin, Germany
3. Department of Plankton and Microbial Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries , 16775 Stechlin, Germany
4. Institute of Biochemistry and Biology, Potsdam University , 14476 Potsdam, Germany
5. Department of Marine Geology, Leibniz Institute for Baltic Sea Research Warnemünde , 18119 Rostock, Germany
6. German Research Centre for Geosciences (GFZ), Section Geomicrobiology , 14473 Potsdam, Germany