1. Ghent University
2. Swiss Federal Research Institute WSL
3. SLU
4. Stockholm University
5. University of Bremen
6. University of Florence
7. Department of Biology, NTNU, Høgskoleringen 5, 7091 Trondheim, Norway
8. Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences
9. CNRS
10. Norwegian University of Science and Technology
11. University of Silesia
12. Université catholique de Louvain
13. University of Stockholm
14. University of Firenze
15. UMR 7058 EDYSAN “Ecologie et Dynamique des Systèmes Anthropisés”, CNRS, Université de Picardie Jules Verne
16. Swiss Federal Institute for Forest, Snow and Landscape Research