1. Education and Research Center for Subtropical Field Science, Faculty of Agriculture, B 200 Monobe, Kochi University, Nankoku, Kochi, 783-8502, Japan.
2. Silvacom Ltd., Edmonton, Canada.
3. Graduate School of Agricultural Science, Ehime University, Matsuyama, 790-8566, Japan.
4. Research fellow, The School of Oceanography and Environmental Science, Xiamen University, Xiamen, Fujian-36005, P.R. China.