1. Department of Environmental Sciences, Niigata University, 8050, 2-cho, Ikarashi, Nishi-ku, Niigata 950-2181, Japan (e-mail: masamichi@env.sc.niigata-u.ac.jp)
2. Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, Illinois 60022, USA
3. School of International Liberal Studies, Waseda University, 1-7-14, Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan
4. Department of Earth Sciences, Faculty of Science, Ibaraki University, 2-1-1, Bunkyo, Mito 310-8512, Japan
5. Kuji Amber Museum, 19-156-133, Kokujicho, Kuji, Iwate 028-0071, Japan
6. Yale School of the Environment, Yale University, 195, Prospect Street, New Haven, Connecticut 06511, USA