1. UR Ecologie et Dynamique des Systèmes Anthropisés (EDYSAN, FRE 3498 CNRS); Jules Verne University of Picardie; 1 Rue des Louvels F-80037 Amiens Cedex 1 France
2. UMR 1201 DYNAFOR; INRA; Chemin de Borde Rouge CS 52627 F-31326 Castanet France
3. Southern Swedish Forest Research Centre; Swedish University of Agricultural Sciences; Box 49 SE-230 53 Alnarp Sweden
4. Landscape Ecology; Department of Geography and Quaternary Geology; Stockholm University; SE-106 91 Stockholm Sweden
5. Forest and Nature Lab; Ghent University; Geraardsbergsesteenweg 267 B-9090 Melle-Gontrode Belgium
6. Vegetation Ecology and Conservation Biology, Institute of Ecology, FB2; University of Bremen; Leobener Strasse D-28359 Bremen Germany
7. IVL Swedish Environmental Research Institute; Box 210 60 S-100 31 Stockholm Sweden
8. Division Forest, Nature and Landscape Research; University of Leuven (KU Leuven); Celestijnenlaan 200E B-3000 Leuven Belgium
9. Institute of Ecology and Earth Sciences; University of Tartu; Lai 40, EE-51005 Tartu Estonia
10. Leibniz-ZALF (e.V.); Institute of Land Use Systems; Eberswalder Strasse 84 D-15374 Müncheberg Germany
11. St Pau Historical Site; St Leopold Pavilion; Forest Sciences Center of Catalonia (CTFC); c/St. Antoni Maria Claret 167 08025 Barcelona Spain
12. Chair of Geobotany, Faculty of Biology; University of Freiburg; Schaenzlestrasse 1 79104 Freiburg Germany