1. Swiss Federal Institute for Forest, Snow and Landscape Research WSL; Birmensdorf Switzerland
2. Forest Ecology, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems; ETH Zürich; Zürich Switzerland
3. Zoological Institute, University of Basel; Basel Switzerland
4. Hintermann and Weber AG; Reinach Switzerland
5. Research Station Petite Camargue Alsacienne; Saint-Louis France