1. School of Environment and Natural Resources, The Ohio State University, Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA
2. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B31 2DX, UK
3. Soil Geography and Landscape Group, Wageningen University, PO Box 47, Wageningen 6700 AA, The Netherlands
4. NERC Centre for Ecology and Hydrology, Bush Estate, Penicuik, Edinburgh EH26 0QB, UK
5. Department of Agricultural, Forest and Food Sciences, University of Torino, Largo Paolo Braccini 2, Grugliasco (TO) 10095, Italy
6. Centro de Investigação e de Tecnologias Agro-Ambientais e Biológicas, Universidade de Tras-os-Montes e Alto Douro, Vila Real, Portugal
7. School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, UK
8. Department of Geography, Swansea University, Swansea, UK
9. School of Environment, Education and Development, The University of Manchester, Manchester M13 9PL, UK
10. Department of Biology, University of Bergen, Postboks 7803, Bergen 5020, Norway