Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Effects of Dissolved Microcystin-LR on the Different Phytoplankton Communities in a Microcosm Scale

용존성 독소 microcystin-LR이 식물플랑크톤 군집에 미치는 영향

  • Suh, Mi-Yeon (Seoul Metropolitan Government, Research Institute of Public Health and Environment) ;
  • Han, Myung-Soo (Department of Environmental Science, Hanyang University) ;
  • Kim, Baik-Ho (Department of Environmental Science, Hanyang University)
  • Published : 2005.09.30
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Abstract

Based on the result that biological control agent (BCA) increased the dissolved microcystin-LR in a field experiment to control the cyanobacterial bloom (Kim etal., 2005), a laboratory experiment was used to evaluate the effects of dissolved microcystin-LR (MCLR) with different concentrations on abundance, dominance, diversity of phytoplankton community, concentration of chlorophyll a and microcystin concentration in replicated microcosms. The treatments in this laboratory experiment comprised different concentrations of T1 (natural MCLR concentration), T10 (ten times to natural MCLR concentration), and T100 (one hundred times to natural MCLR concentration). MCLR treatment of exclusively Stephanodiscus hantzschii-dominated community in Chonho bridge hardly changed in algal species, but abundance. In Kildong pond, Aulacoseira and Dinobryonrich community was replaced by green algae Scenedesmus-rich community especially in T100 experiment. However, in Yangsoori-Ryukgakji Pond having the highest concentration of initial MCLR, Microcystis aeruginosa was decreased in abundance. Therefore, the treatment of BCA to control M. aeruginosa severely changed the Phytoplankton community in term of algal species, abundance (chlorophyll a) and dissolved microcystin-LR via a high release of MCLR.

남조 대발생을 제어하기 위한 생물제재의 처리가 수중 생태계에 미치는 영향을 파악하는 연구의 일환으로, 살조세균 처리이후 증가된 용존성 microcystin-LR (MCLR)이 식물플랑크톤 군집의 종조성 및 현존량, 그리고 조류독소 분포에 어떠한 영향을 주는 지를 파악하기 위하여, MCLR standard를 성격이 다른 3가지 현장수를 넣은 시험관에 대조군, 현장 농도의 10배, 100배 씩 처리하고 식물플랑크톤 생물량, 엽록소 a,환경요인, 독소량 등의 변화를 각각 조사하였다. 규조 Stephanodiscus hantzschii가 압도적으로 우점하였던 천호대교에서는 독소처리이후 현존량은 점차 감소하였으며 종조성은 크게 변하지 않았으며, 규조 Aluacoseira와 황색편모조 Dinobryon이 우점한 길동생태공원에서는 현존량이 크게 감소한 반면, 고농도 처리에서는 녹조 Scenedesmus가 크게 발달하였다. 남조류와 용존성 MCLR 농도가 가장 높았던 양수리 육각지에서는 남조 M. aeruginosa 감소 및 총 현존량의 감소가 일어났다. 이상의 결과는 생물제재 처리이후 남조 M. aeruginosa 사멸에 따른 용존성 독소의 증가가 수중내 식물플랑크톤 군집의 종조성 및 현존량 변화를 더욱 심화시키는 것으로 밝혀졌다.

Keywords

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