Affiliation: | Swiss Ornithological Institute, CH-6204 Sempach, Switzerland,;Institute of Environmental Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland,;Forest Research Institute of Baden-Wuerttemberg FVA, Wonnhaldestr. 4, D-79100 Freiburg im Breisgau, Germany, and;Institute of Biochemistry, Department of Natural Sciences, University of Veterinary Medicine, Veterinärplatz 1, A-1210 Vienna, Austria |