1. Department of Environmental Sciences, Section of Conservation Biology; University of Basel; St. Johanns-Vorstadt 10 CH-4056 Basel Switzerland
2. Kyoto Women's University; Kitahiyoshi-cho 35 Higashiyama-ku Kyoto 605-8501 Japan
3. Faculty of Human Environment; Nagasaki Institute of Applied Science; 536 Aba-machi Nagasaki 851-0193 Japan
4. Tokyo Keizai University; Minami-machi 1-7-34 Kokubunji Tokyo 185-8502 Japan