1. Department of Forest Science, Graduate School of Agriculture Hokkaido University Hokkaido Japan
2. Department of Forest Vegetation Forestry and Forest Products Research Institute Tsukuba Japan
3. Fenner School of Environment and Society Australian National University Canberra Australian Capital Territory Australia
4. Shikoku Research Center Forestry and Forest Products Research Institute Asakuranishi Kochi Japan
5. Biodiversity Assessment and Projection Section, Center for Environmental Biology and Ecosystem Studies National Institute for Environmental Studies Tsukuba City Japan
6. Faculty of Environmental Earth Science Hokkaido University Sapporo Hokkaido Japan
7. Japan Bird Research Association Tokyo Japan