1. Department of Limnology and Bio-Oceanography, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
2. Department of Ecogenomics and Systems Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
3. Department of Symbiosis, Max-Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359 Bremen, Germany