1. Institute of Biology and Nordic Center for Earth Evolution, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark.
2. Department of Biological Engineering and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02138, USA.
3. National Environmental Research Institute, Aarhus University, Vejlsøvej 25, Post Office Box 314, DK-8600 Silkeborg, Denmark.
4. Section of Microbiology, Department of Biological Sciences, Aarhus University, DK-8000 Aarhus C, Denmark.
5. Departamento de Oceanografía and Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental, Universidad de Concepción, Casilla-160-C, Concepción, Chile.