1. Max Planck Institute for Marine Microbiology Celsiusstrasse 1 Bremen 28359 Germany
2. Department of Geoscience University of Calgary 2500 University Drive Calgary AB T2N 1N4 Canada
3. Department of Microbiology and Ecosystem Science Division of Microbial Ecology University of Vienna Althanstr. 14 A‐1090 Vienna Austria
4. Elba Field Station HYDRA Institute for Marine Sciences Via del Forno 80 Campo nell'Elba LI 57034 Italy