1. University of Tübingen Geoecology Rümelinstr. 19–23 72070 Tübingen Germany
2. Swiss Federal Research Institute WSL Department of Biodiversity and Conservation Biology, Ecosystem Dynamics Zürcherstrasse 111 8903 Birmensdorf Switzerland
3. University of Hohenheim Institute of Soil Science and Land Evaluation, Department of Soil Biology Emil-Wolff-Str. 27 70593 Stuttgart Germany
4. University of Cologne Terrestrial Ecology, Institute of Zoology Zülpicher Str. 47b 50674 Köln Germany
5. University of Bern Institut of Plant Sciences and Botanical Garden Altenbergrain 21 3013 Bern Switzerland
6. University of Münster Institute of Landscape Ecology Heisenbergstr. 2 48149 Münster Germany
7. University of Potsdam Institute for Biochemistry and Biology Maulbeerallee 1 14469 Potsdam Germany
8. Max-Planck-Institute for Biogeochemistry Department for Biogeochemical Processes Hans-Knöll-Str. 10 07745 Jena Germany