Chiang Mai Journal of Science

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        The study of the distribution of toxic algae and water quality in the reservoir of Mae Kuang Udomtara Dam in Chiang Mai province was carried out during April 1999 to September 2000. The reservoir was found to be contaminated by toxic algae i.e. Microcystis aeruginosa Kutz, Cylindrospermopsis raciborskii (Wolosz.) Seenayya & Subba, which was in higher number than other species of algae, Anabaena apbanizomenoides Forti, Anabaena catenula (Kg.) Born. et Flah., M. wesenbergii Komärek, Oscillatoria vizagapatensis C.B. Rao, and Phormidium tenue (Menegh) Gom. 
        M. aeruginosa was found in high amounts at the water surface during 2 periods, from April to July 1999 and July to August 2000. whilst another six species of toxic algae were also found in different amounts. For microcystins analysis, microcystin-RR was found in a higher amount whilst microlcystin-LR and -YR were also found in small amounts, the highest level of microcystins found in the water was 150 ng.L^-1, and was lower than those determined by the World Health Organization for the guideline value of drinking water. Distribution of algal cells and microcystins at different water levels were also investigated. The algal cells concentrated mainly at the water surface. whereas the amount of each toxin did not depend on the water depth. Factors which tended to be correlated with the blooming of M. aeruginosa were water volume, temperature and light intensity. 
        Water quality of this reservoir was classified as an oligotrophic-mesotrophic status. Based on the standard surface water quality, the reservoir was classified to be the second to third category and was relatively clean for water supplies when treated properly.

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