1. University of Rostock, Department Maritime Systems, Faculty of Interdisciplinary Research, 18059 Rostock, Germany
2. University of Rostock, Institute of Biological Sciences, Faculty of Mathematics and Natural Science, 18059 Rostock, Germany
3. Senckenberg am Meer, German Centre for Marine Biodiversity Research DZMB, 26382 Wilhelmshaven, Germany
4. Christian-Albrechts-University of Kiel, Institute for Ecosystem Research, Faculty of Mathematics and Natural Science, 24098 Kiel, Germany
5. Leibniz Institute for Baltic Sea Research Warnemünde, Department Marine Nitrogen Cycling, 18119 Rostock, Germany