1. Forest Ecology; Institute of Terrestrial Ecosystems; ETH Zürich; Zürich CH-8092 Switzerland
2. CEFE UMR 5175; CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE; Bioflux Team; 1919 route de Mende F-34293 Montpellier Cedex 5 France
3. Environmental Physics; Institute for Environmental Sciences; University of Koblenz-Landau; Fortstraße 7 Landau D-76829 Germany
4. Centre for Biodiversity Theory and Modelling; Experimental Ecology Station; Centre National de la; Recherche Scientifique Moulis F-09200 France
5. University of Freiburg; Faculty of Biology - Geobotany; Schaenzlestr. 1 Freiburg D-79104 Germany