1. Bavarian Forest National Park; Freyunger Str. 2 94481 Grafenau Germany
2. 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 85354 Freising Germany
3. Department of Ecology, Animal Ecology; Faculty of Biology; Philipps-Universität Marburg; Karl-von-Frisch-Str. 8 35032 Marburg Germany
4. Institute for Environmental Sciences; Ecosystem Analysis; University of Koblenz-Landau; Fortstr. 7 76829 Landau Germany
5. Epidemiology, Biostatistics and Prevention Institute; University of Zurich; Hirschengraben 84 8001 Zürich Switzerland
6. Ecology Group/Developmental Biology Division; Biology Department; University of Erlangen-Nuremberg; Staudtstr. 5 91058 Erlangen Germany