1. Environmental Science and Technology Program, Faculty of Science, Lampang Rajabhat University, Lampamg, Thailand
2. Deparment of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
3. Department of Botany, National Museum of Nature and Science, Tsukuba, Japan
4. Department of Biological Sciences, St. Cloud State University, St. Cloud, USA
5. Advanced Support Center for Science Teachers, Tokyo Gakugei University, Tokyo, Japan
6. Tokyo Diatomology Lab, Tokyo, Japan