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The Korean Society of Phycology (한국조류학회(藻類))
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Diel Vertical Distribution of Cyanobacteria in Lake Daecheong

대청호의 남조세균 일주 수직분포

  • Published : 2006.03.31
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Abstract

Cyanobacteria regulate their buoyancy in response to changing environmental conditions. This process is essential for cyanobacterial development and can account for their dominance in eutrophic waters in summer. The present investigation was conducted to understand the 24-hour vertical distribution of cyanobacteria and water quality characteristics in Lake Daecheong. Water samples were collected and analyzed at depth intervals of 2 or 3 m and at an interval of three hours for a day on August 28, 2001 and September 24, 2002. In 2001 the accumulated standing crop of Microcystis spp. from surface to a depth of 6 m was 94.9%. Microcystis spp. showed no vertical migration below the thermocline. Microcystis spp. had maximum density near the surface, but shifted to 2 m depth at 2 p.m. A dense population of Anabaena spp. accumulated near the surface from 2 to 5 p.m. in 2002.

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