1. Department of Natural and Cultural Resources, University of Ferrara, Corso Porta Mare 2, I‐44100 Ferrara, Italy;
2. Department of Biology, University of Joensuu, PO Box 111, FIN‐80101 Joensuu, Finland;
3. Slovenian Forestry Institute, Department of Forest Ecology, Večna pot 2, SI‐1000 Ljubljana, Slovenia;
4. Department of Plant Ecology, Evolutionary Biology Centre, Uppsala University, Villavägen 14, SE‐75236 Uppsala, Sweden;
5. Department of Environmental Sciences, Wageningen University, Bornsesteeg 69, 6708 PD Wageningen, The Netherlands;
6. Department of Botany, Masaryk University, Kotlářská 2, CZ‐611 37 Brno, Czech Republic;
7. LIN’eco, Ecological Engineering, PO Box 51, 2732 Reconvilier, Switzerland;
8. Faculty of Biological Sciences, Branišovskă 31, CZ‐370 05 České Bud ě jovice, Czech Republic;
9. Department of Ecology, The Royal Veterinary and Agricultural University, Rolighedsvej 21, 1958 Frederiksberg, Denmark;
10. Department of Earth Sciences, University of Parma, Parco Area delle Scienze 157, I‐43100 Parma, Italy