1. Biodiversity and Climate Research Centre; Senckenberg Gesellschaft für Naturforschung; 60325 Frankfurt am Main Germany
2. Department of Ecology and Evolution; Stony Brook University; Stony Brook NY 11789 USA
3. Department of Computational Landscape Ecology; Helmholtz Centre for Environmental Research-UFZ; 04318 Leipzig Germany
4. Biometry and Environmental System Analysis, Faculty of Forest and Environmental Sciences; University of Freiburg; 79106 Freiburg Germany
5. Laboratoire d'Écologie Alpine; Université Joseph Fourier; UMR-CNRS 5553 38041 Grenoble Cedex 9 France
6. Institute of Systematic Botany; University of Zurich; CH 8008 Zurich Switzerland