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Effect of phosp.orus fluctuation caused by river water dilution in eutrophic lake on competition between blue-green alga Microcystis aeruginosa and diatom cyclotella sp.

引用

Journal of Environmental Sciences 2010年第11期22卷 1666-1673页

作者： Yoshimasa Amano Yusuke Sakai Takumi Sekiya Kimitaka Takeya Kazuo Taki Motoi Machida Graduate School of Engineering Chiba University Safety and Health Organization Chiba University Faculty of Engineering Chiba Institute of Technology

Tega-numa （Lake Tega） is one of the eutrophic lakes in Japan. For the improvement of water quality in Lake Tega, the North- chiba Water Conveyance Channel was constructed in 2000, which transfer water from Tone River into the lake. After 2000, the dominant sp.cies of diatoms, mainly cyclotella sp., have been replacing blue-green algae, mainly Microcystis aeruginosa in Lake Tega. This transition of dominant sp.cies would be due to the dilution, but the detail mechanism has not been understood yet. This study examined the relationship between phosp.orus fluctuation caused by river water dilution to Lake Tega and dominance of algal sp.cies, M. aeruginosa or cyclotella sp. based on the single-sp.cies and the mixed-sp.cies culture experiments. The single-sp.cies culture experiment showed that the half-saturation constant and uptake rate of phosp.orus were one order lower and seven times higher for M. aeruginosa than those for cyclotella sp. These findings implied that M. aeruginosa would possess a potential for the growth and survival over cyclotella sp. in the phosp.orus limited condition. The superiority of M. aeruginosa was reflected in the outcome of the mixed-sp.cies culture experiment, i.e., dominance of M. aeruginosa, even phosp.orus concentration was lowered to 0.01 mg-P/L. Therefore, it could be concluded that the decrease in phosp.orus concentration due to the river water dilution to Lake Tega would be interpreted as a minor factor for the transition of dominant sp.cies from M. aeruginosa to cyclotella sp.

关键词： eutrophic lake water quality improvement water blooms Microcystis aeruginosa cyclotella sp.

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