Samuel Hermant^1,2, Katrine Grønbæk Ahlmann³, Cathrin Wittig⁴, Astrid Hylén⁵, Sebastiaan van de Velde^6,7, Erik Kristensen³, Carl Van Colen⁸ and Ulrike Braeckman^1,9, (1)Marine Biology, Dpt. of Biology, Ghent University, Ghent, Belgium, (2)Institute of Natural Sciences, Brussels, Belgium, (3)University of Southern Denmark, Department of Biology, Odense M, Denmark, (4)Ghent University, Marine Biology Research Group, Department of Biology, Ghent, Belgium, (5)Aix-Marseille Université, CNRS, IRD, INRAE, CEREGE, Aix-en-Provence, France, (6)Department of Marine Science, University of Otago, Dunedin, New Zealand, (7)Earth Sciences New Zealand, Wellington, New Zealand, (8)Ghent University, Marine Biology Research Group, Department of Biology, Gent, Belgium, (9)Institute of Natural Sciences, MARECO, Brussels, Belgium