1. Section for Bacteriology, Pathology and Parasitology, Technical University of Denmark, Frederiksberg C, Denmark
2. Department of Bioscience, Arctic Research Centre, Aarhus University, Roskilde, Denmark
3. Department of Plants and the Environment, Faculty of Sciences, University of Copenhagen, Frederiksberg C, Denmark
4. Institute of Applied Conservation, University of Freiburg, Freiburg, Germany
5. Arctic Ecology Research Group, Francheville, France
6. Laboratoire Biogeosciences, Biogeosciences, The Joint Research Units, The National Centre for Scientific Research, University of Burgundy, Dijon, France