1. Dep. of Agriculture; Meiji Univ.; 1-1-1 Higashimita Kawasaki Kanagawa 214-8571 Japan
2. Dep. of Ecoregion Science; Tokyo Univ. of Agriculture and Technology; Fuchu, Tokyo 183-8509 Japan
3. Dep. of Earth and Environmental Sciences; Univ. of Texas at Arlington; 500 Yates St. Arlington TX 76019