1. Animal Ecology, Bielefeld University, Konsequenz 45, 33615 Bielefeld, Germany
2. Réserve Naturelle Nationale de la Fôret de la Massane, Laboratoire Arago, 1 Avenue Pierre Fabre, 66650 Banyuls-sur-Mer, France
3. Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
4. Ecossa, Giselastrasse 6, 82319 Starnberg, Germany