Jordan Gault¹, Jan A Freund², Helmut Hillebrand² and Thilo Gross¹, (1)Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg, Oldenburg, Germany, (2)Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany