Sampan Tongnunui
Conservation Biology Program, Mahidol University, Kanchanaburi Campus, Lum Sum, Sai Yok, Kanchanaburi Province, 71150 Thailand. (Corresponding author).
Frederick W. H. Beamish
Environmental Science Program, Faculty of Science, Burapha University, Bang Saen, Chonburi Province, 20131 Thailand.
Amnuay Wattanakornsiri
Department of Agriculture and Environment, Faculty of Science, Surindra Rajabhat University, Nok-muang, Muang, Surin Province, 32000 Thailand.