1. Department of Botany and Zoology; Masaryk University; Brno Czech Republic
2. Department of Invasion Ecology; Institute of Botany; The Czech Academy of Sciences; Průhonice Czech Republic
3. Alterra Wageningen UR; Wageningen The Netherlands
4. Department of Plant Biology and Ecology; University of the Basque Country UPV/EHU; Bilbao Spain
5. Institute of Plant Sciences; University of Graz; Graz Austria
6. Institute of Biodiversity and Ecosystem Research; Bulgarian Academy of Sciences; Sofia Bulgaria
7. Lancaster UK
8. Faculty of Forestry; University of Zagreb; Zagreb Croatia
9. Institute of Biology; Martin Luther University Halle-Wittenberg; Halle Germany
10. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig; Leipzig Germany
11. Faculty of Forestry; Weihenstephan-Triesdorf University of Applied Sciences; Freising Germany
12. Faculty for Agricultural and Environmental Sciences; University of Rostock; Rostock Germany
13. School of Biology; Aristotle University of Thessaloniki; Thessaloniki Greece
14. Institute of Ecology and Botany; MTA Centre for Ecological Research; Vácrátót Hungary
15. ISPRA - Italian National Institute for Environmental Protection and Research; Roma Italy
16. Department of Environmental Biology; Sapienza University of Roma; Roma Italy
17. Institute of Botany; Nature Research Centre; Vilnius Lithuania
18. Institute of Biology; Faculty of Natural Sciences and Mathematics; University of Ss. Cyril and Methodius; Skopje Republic of Macedonia
19. Southern Swedish Forest Research Centre; Swedish University of Agricultural Sciences; Alnarp Sweden
20. UR “Ecologie et Dynamique des Systèmes Anthropisés” (EDYSAN, FRE3498 CNRS-UPJV); Université de Picardie Jules Verne; Amiens Cedex 1 France
21. Section for Ecoinformatics & Biodiversity; Department of Bioscience; Aarhus University; Aarhus C Denmark
22. Department of Vegetation Ecology; University of Wrocław; Wrocław Poland
23. Institute of Botany; Plant Science and Biodiversity Centre; Slovak Academy of Sciences; Bratislava Slovakia
24. Institute of Biology; Research Centre of the Slovenian Academy of Sciences and Arts; Ljubljana Slovenia
25. Institute of Environmental Sciences; Castilla-La Mancha University; Toledo Spain
26. WSL Swiss Federal Research Institute; Birmensdorf Switzerland
27. M.G. Kholodny Institute of Botany; NAS of Ukraine; Kyiv Ukraine
28. Department of Ecology; Charles University; Prague Czech Republic
29. Department of Botany and Zoology; Centre for Invasion Biology; Stellenbosch University; Matieland South Africa