1. Organismal & Evolutionary Biology; Faculty of Biological & Environmental Sciences; University of Helsinki; PO Box 65 00014 Helsinki Finland
2. Department of Geobiology; University of Göttingen; Goldschmidtstraße 3 37077 Göttingen Germany
3. Microbial Communication; Friedrich Schiller University Jena; Neugasse 25 07743 Jena Germany
4. Finnish Museum of Natural History; University of Helsinki; PO Box 7 00014 Helsinki Finland