1 Department of Earth and Environmental Sciences, Paleontology & Geobiology, Ludwig-Maximilians-Universität München, Munich, Germany. w.orsi@lrz.uni-muenchen.de.
3 Department of Earth and Environmental Sciences, Paleontology & Geobiology, Ludwig-Maximilians-Universität München, Munich, Germany.
4 Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.
5 Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany.
6 Baltic Sea Research Institute, Warnemünde, Rostock, Germany.