Mike Smykala, Carl von Ossietzky Universität Oldenburg, Institute for Chemistry and Biology of the Marine environment (ICBM), Oldenburg, Germany, Bert Engelen, Carl von Ossietzky Universität Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany, Birte Matthiessen, GEOMAR Helmholtz Centre for Ocean Research Kiel, Experimental Ecology, Kiel, Germany and Stefanie Moorthi, Carl von Ossiertky Universität Oldenburg, Institute for Chemistry and Biology of the Marine environment (ICBM), Oldenburg, Germany