1. Institute of Groundwater Ecology, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstrasse 1, D-85764 Neuherberg, Germany
2. University of Waterloo, Department of Earth and Environmental Sciences, Ecohydrology, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
3. University of Tübingen, Center for Applied Geoscience, Hölderlinstrasse 12, 72074 Tübingen, Germany
4. University Duisburg-Essen, Biofilm Centre, Universitätsstrasse 5, D-45141 Essen, Germany
5. Technical University of Munich, Chair of Analytical Chemistry and Water Chemistry, Marchioninistrasse 17, 81377 Munich, Germany