1. Geography Department; Humboldt-Universität zu Berlin; Berlin Germany
2. Department of Environmental Biology; Sapienza, Università di Roma; Rome Italy
3. Rubenstein School of Environment and Natural Resources; University of Vermont; Burlington Vermont USA
4. European Forest Institute; Bonn Germany
5. European Forest Institute; Joensuu Finland
6. Faculty of Environment and Natural Resources; University of Freiburg; Freiburg Germany
7. The Danish Nature Agency; Randbøl Denmark
8. Institute of Forest Management; National University of Forestry and Wood Technology; Lviv Ukraine
9. Réserves Naturelles de France; Dijon Cedex France
10. Institute of Ecology and Botany; MTA Centre for Ecological Research, Vácrátót Hungary
11. Department of Agricultural, Forest and Food Sciences (DISAFA); University of Torino; Grugliasco Italy
12. Forest Research Institute of Thessaloniki; Vassilika Greece
13. Department of Agraria; Mediterranean University of Reggio Calabria; Reggio Calabria Italy
14. Centre for Applied Ecology “Professor Baeta Neves” (CEABN); InBio; School of Agriculture; University of Lisbon; Lisbon Portugal
15. Northwest German Forest Research Institute; Göttingen Germany
16. Asplan Viak; Sandvika Norway
17. Faculty of Forestry; Department of Forest Ecology and Silviculture; University of Zagreb; Zagreb Croatia
18. Faculty of Forestry and Wood Sciences; Czech University of Life Sciences Prague; Praha-Suchdol Czech Republic
19. Institute of Forest Management and Wood Science; Aleksandras Stulginskis University; Akademija Lithuania
20. CITAB Centre of the Research and Technology of Agro-Environmental and Biological Science; University of Trás-os-Montes and Alto Douro; Vila Real Portugal
21. Dendrology Department; University of Forestry; Sofia Bulgaria
22. Greensway AB; Uppsala Sweden
23. Faculty of Forestry in Skopje; Department of Botany and Dendrology; Ss. Cyril and Methodius University in Skopje; Skopje Republic of Macedonia
24. WSL Swiss Federal Institute of Forest; Snow and Landscape Research; Birmensdorf Switzerland
25. Faculty of Forestry; Institute of Forest Ecology and Silviculture; University of Agriculture; Kraków Poland
26. School of Forest Sciences; University of Eastern Finland; Joensuu Finland
27. WWF Danube-Carpathian Programme Ukraine; Lviv Ukraine
28. Forest Ecology Department; Silva Tarouca Research Institute; Brno Czech Republic
29. Institute of Biodiversity and Ecosystem Research; Bulgarian Academy of Sciences; Sofia Bulgaria