1. Institute for Experimental Medicine, Kiel University, Michaelisstraße 5, 24105 Kiel, Germany
2. Max Planck Institute for Evolutionary Biology, August-Thienemann-Straße 2, 24306 Plön, Germany
3. Department of Ecophysiology, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Str. 10, 35043 Marburg, Germany