Southwest Vietnam Thu T. Nguyen a , Maki Tsujimura b *, Shibasaki Naoaki c a Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572 Japan. b Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai...