Bronwyn E Cahill¹, Peter Croot², Miroslaw Darecki³, Thomas W Davies⁴, Alan Deidun⁵, Adam Gauci⁵, Helene Frigstad⁶, Franz Hölker⁷, Mark Johnson⁸, Marta Moyano⁹, Andreas Jechow¹⁰, Anders Opdal¹¹, Piotr Kowalczuk³, Timothy James Smyth¹², Oliver Zielinski¹³, Sabine Schlacke¹⁴ and Markus Venohr⁷, (1)Leibniz Institute for Baltic Sea Research, Rostock, Germany, (2)University of Galway, School of Natural Sciences, Earth and Ocean Sciences, Galway, Ireland, (3)Institute of Oceanology Polish Academy of Sciences, Sopot, Poland, (4)University of Plymouth, Plymouth, United Kingdom, (5)University of Malta, Msida, Malta, (6)Norwegian Institute for Water Research, Oslo, Norway, (7)Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Community and Ecosystem Ecology, Berlin, Germany, (8)University of Galway, School of Natural Sciences and Ryan Institute, Galway, Ireland, (9)Norwegian Institute for Water Research, Institute for Hydrobiology and Fisheries Science, Oslo, Norway, (10)Brandenburg University of Applied Sciences, Brandenburg, Germany, (11)University of Bergen, Bergen, Norway, (12)Plymouth Marine Laboratory, Plymouth, Devon, UNITED KINGDOM, (13)Leibniz Institute for Baltic Sea Research Warnemuende, Rostock, Germany, (14)University of Greifswald, Greifswald, Germany