1. Laboratoire d'Ecologie Alpine; CNRS UMR 5553; Université Joseph Fourier; BP 53 38041 Grenoble Cedex 9 France
2. AgroEcology Department; Rothamsted Research; Harpenden Herts AL5 2JQ UK
3. Faculty of Life Sciences; Michael Smith Building; The University of Manchester; Oxford Road Manchester M13 9PT UK
4. Institute of Botany; Czech Academy of Sciences; Dukelská 135 CZ-379 82 Třeboň Czech Republic
5. Department of Ecological Science; VU University Amsterdam; De Boelelaan 1085 1081 HV Amsterdam the Netherlands
6. Laboratoire d'Ecologie Microbienne; Université de Lyon; Université Lyon 1; INRA (USC 1193); CNRS (UMR 5557); Bât Mendel, 43 bd du 11 novembre 1918 69622 Villeurbanne France
7. Swiss Federal Research Institute WSL; Community Ecology; Via Belsoggiorno 22 CH-6500 Bellinzona Switzerland
8. Centre for Sustainability, Environment and Health; RIVM; Box 1 Bilthoven 3720 BA the Netherlands
9. The James Hutton Institute; Craigiebuckler Aberdeen AB15 8QH UK
10. IMBIV (CONICET-UNC) and FCEFyN; Universidad Nacional de Córdoba; Casilla de Correo 495 5000 Córdoba Argentina