1. Terrestrial Ecology Research Group; Department of Ecology and Ecosystem Management; Center for Food and Life Sciences Weihenstephan; Technische Universität München; Hans-Carl-von-Carlowitz-Platz 2 DE-85354 Freising Germany
2. Institute for Ecology; Friedrich-Schiller University Jena; Dornburger Strasse 159 DE-07743 Jena Germany