1. Laboratory of Forest Conservation Biology, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan
2. Division of Forest Research and Nature Restoration Planning, Kanagawa Prefecture Natural Environment Conservation Center, Atsugi, Kanagawa, Japan
3. Japan Nature and Ecology College, Niigata, Japan
4. Kanagawa Wildlife Damage Control Support Center, Kanagawa Prefecture Natural Environment Conservation Division, Atsugi, Kanagawa, Japan
5. Faculty of Agriculture, Yamagata University, Yamagata, Japan