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KMID : 0613820110210081183
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Journal of Life Science
2011 Volume.21 No. 8 p.1183 ~ p.1189
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Effect of Environmental Factors on the Growth of Microcystis aeruginosa (Cyanobacteria) in Agricultural Reservoirs
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Kwon O-Chang
Park Jung-Won
Chung Gyu-Young
Lee Jong-Eun
Seo Eul-Won
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Abstract
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The present study is aimed at examining the effects of the physico-chemical environmental factors of water systems on water bloom at Homin and Gagok reservoirs in Pungcheon-Myeon, Andong, Gyeongsangbuk-do. The mean water temperature and the contents of chlorophyll-a, total-nitrogen, total-phosphorus and phosphate-phosphorus were higher at the Gagok reservoir. On the other hand, the pH mean value was higher at the Homin reservoir. The mean value of microelements (Na, K, Mg, Fe, Si) was higher at the Gagok reservoir. The cyanobacteria which was considered to be the cause of water bloom at the two reservoirs was Microcystis aeruginosa. It started to grow in May and showed the highest standing crop in August. Between the increase of standing crop of M. aeruginosa and the water quality, correlation values of Na? (r=-0.910, p＜0.05), Fe²? (r=-0.855, p＜0.05) and Si⁴? (r=0.989, p＜0.01) at the Homin reservoir increased amount of standing crop. Meanwhile, at the Gagok reservoir, the contents of Na? (r=-0.776, p＜0.05), Si⁴? (r=0.899, p＜0.05) were highly related to the increase of standing crop. Interestingly, Si, which is the limiting factor for diatoms, has a high correlation with standing crop of cyanobacteria. In conclusion, the water blooming is caused not by a simple factor but a synergistic effect due to complex actions including high concentrations of nitrogen and phosphorus ions and many other environmental factors.
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KEYWORD
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Agricultural reservoir, water blooming, Microcystis aeruginosa, water quality
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