1. Department of Physical Geography; Stockholm University; Svante Arrheniusväg 106 91 Stockholm Sweden
2. Vegetation Ecology and Conservation Biology; University of Bremen; FB02 Leobener Strasse NW 2, 28359 Bremen Germany
3. School of Natural Sciences; Technology and Environmental Studies, Södertörn University; Alfred Nobels Allée 7 14189 Stockholm Sweden
4. Forest & Nature Lab; Ghent University; Geraardsbergsesteenweg 267 9090 Melle-Gontrode Belgium
5. Department of Biology; Norwegian University of Science and Technology; Høgskoleringen 5 7491 Trondheim Norway
6. Southern Swedish Forest Research Centre; Swedish University of Agricultural Sciences; Box 49, 23053 Alnarp Sweden
7. Ecologie et Dynamique des Systèmes Anthropisés (EDYSAN, FRE 3498 CNRS-UPJV); Jules Verne University of Picardie; 1 rue des Louvels F-80037 Amiens Cedex France
8. Community Ecology; University of Potsdam; Maulbeerallee 1, 14469 Potsdam Germany
9. Division Forest, Nature and Landscape; University of Leuven; Celestijnenlaan 200E, 3001 Leuven Belgium
10. Institute of Ecology and Earth Sciences; University of Tartu; Lai 40, 51005, Tartu Estonia
11. Leibniz Center for Agricultural Landscape Research (ZALF); Institute of Land Use Systems; Eberswalder Straße 84, 15374 Müncheberg Germany