Algae growth potential test results classified by layer in Lake Nakaumi [Japan]
2003
Michiue, T. (Tottori-ken. Inst. of Public Health and Environmental Science, Yurihama (Japan)) | Nanjo, Y. | Nakamura, H. | Ikeda, R.
The Lake Nakaumi is a brackish-water lake located between Tottori and Shimane Prefectures with a salinity of 9600 mg 1-1. The occurrence of red tide in the lake caused by an increase of Prorocentrum minimum, which grows rapidly from autumn to the following spring, become a rather large problem. The mass generation of this plankton is believed to be a result of the layer of discontinuity within the lake being upset by strong winds or other conditions, allowing the nutrient-rich lower layer waters to mix with the upper layer water, thus spreading the phosphorus and other nutrient salts contained therein. Although research focusing on the currents and water-flow patterns concerning this phenomenon is being carried out, no research involving the plankton or actual lake water is currently being done. Therefore, the present AGP test was conducted, proving that not only does the upper layer water contain the potential for causing red tide, but the lower layer water also holds sufiicient, potential for causing the same phenomenon during the season in which red tide often ocours in the lake.
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