1. Institute of Ecology, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
2. Institute of Microbiology, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
3. Research Unit of Biodiversity, Spanish National Research Council (CSIC), E-33600 Mieres, Spain
4. Department of Biosciences, Swansea University, Singleton Park, Swansea SA2 8PP, U.K.
5. Department of Geography, Swansea University, Singleton Park, Swansea SA2 8PP, U.K.
6. Department of Environmental Geosciences, Centre for Microbiology and Environmental Systems Science, University of Vienna, Althanstraße 14, 1090 Wien, Austria