1. United Nations University-Institute of Advanced Studies Operating Unit Ishikawa/Kanazawa, Shiinoki Cultural Complex, 3F, 2-1-2 Hirosaka, Kanazawa, Ishikawa 920-0962, Japan
2. Department of Subtropical Agricultural Science, Faculty of Agriculture, University of the Ryukyus, 1-banchi, Senbaru, Nishihara, Okinawa 903-0213, Japan