Allyson Tessin, University of Southern Mississippi, Stennis Space Center, United States, Christian März, University of Leeds, Leeds, United Kingdom, Hans-J Brumsack, University of Oldenburg, Oldenburg, Germany, Jens J Matthiessen, Alfred Wegener Institute, Bremerhaven, Germany, Marie-Amélie Blais, Université Laval, QC, Canada, Matt O'Regan, Stockholm University, Department of Geological Sciences, Stockholm, Sweden and Bernhard Schnetger, University of Oldenburg, ICBM Microbiogeochemistry Research Group, Oldenburg, Germany