1. Department of Forest Sciences Faculty of Agriculture and Forestry University of Helsinki Helsinki Finland
2. Department of Soil Ecology University of Bayreuth Bayreuth Germany
3. Department of Environmental and Biological Sciences University of Eastern Finland Kuopio Finland
4. Natural Resources Institute Finland (Luke) Helsinki Finland
5. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Potsdam Germany
6. Department of Agricultural Sciences South Eastern Kenya University Kitui Kenya
7. Biodiversity Unit Kevo Subarctic Research Institute University of Turku Turku Finland
8. Helsinki Institute of Life Science (Hilife) University of Helsinki Helsinki Finland