1. Exobiology Branch, NASA Ames Research Center, Moffett Field, California, USA
2. Hydrology and Quantitative Water Management Group, Wageningen University and Research, Wageningen, The Netherlands
3. Department of Microbiology, Radboud University Nijmegen, Nijmegen, The Netherlands
4. Netherlands Earth System Science Centre (NESSC), Utrecht, The Netherlands
5. German Research Centre for Geosciences (GFZ), Section 3.7 Geomicrobiology, Potsdam, Germany
6. Agricultural Application Research, SKW Piesteritz GmbH, Cunnersdorf, Germany