1. University of Vienna, Faculty of Life Sciences, Department of Marine Biology, Althanstrasse 14, 1090 Vienna, Austria
2. Université Montpellier 2, UMR5119 CNRS IRD IFREMER ECOLAG, Place E. Bataillon, Case 093, 34095 Montpellier Cedex 05, France
3. Microbial Ecology and Biogeochemistry Group, CNRS, and Université Pierre et Marie Curie-Paris 6, Laboratoire d'Océanographie de Villefranche, BP 28, 06234 Villefranche-sur-Mer Cedex, France
4. University of Bergen, Department of Biology, Jahnebakken 5, 5020 Bergen, Norway