1. Eurac Research; Viale Druso 1 Bolzano 39100 Italy
2. Institute of Forest Botany and Forest Zoology; Technische Universität Dresden; Dresden 01062 Germany
3. Department of Ecology; University of Innsbruck; Sternwartestrasse 15 Innsbruck 6020 Austria
4. Department of Botany; University of Innsbruck; Sternwartestrasse 15 Innsbruck 6020 Austria