1. Max Planck Institute for Marine Microbiology; Bremen 28359 Germany
2. Max Planck Institute for Biophysical Chemistry; Göttingen 37077 Germany
3. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research; Bremerhaven 27570 Germany
4. Center for Biotechnology, Bielefeld University; Bielefeld 33615 Germany
5. MARUM, Center for Marine Environmental Sciences, University Bremen; Bremen 28359 Germany