1. Geomicrobiology Group, Department of Geoscience, University of Tuebingen, Schnarrenbergstrasse 94-96, 72076 Tuebingen, Germany
2. Environmental Systems Analysis, Department of Geoscience, University of Tuebingen, Schnarrenbergstrasse 94-96, 72076 Tuebingen, Germany
3. Cluster of Excellence: EXC 2124: Controlling Microbes to Fight Infection, 72074 Tuebingen, Germany
4. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, BS8 1RJ Bristol, United Kingdom