Ecological Study on the Toxic Microcystis in the Lower Nakdong River

洛東江 하류 수계의 毒性 Microcystis 生態 연구

  • Choi, Ae-Ran (Environmental Biotechnology Laboratory, Korea Research Institute of Biosicience and Biotechnology) ;
  • Oh, Hee-Mock (Environmental Biotechnology Laboratory, Korea Research Institute of Biosicience and Biotechnology) ;
  • Lee, Jin-Ae (School of Environmental Science and Engineering, Inje University)
  • 최애란 (한국생명공학연구원 환경생명공학연구실) ;
  • 오희목 (한국생명공학연구원 환경생명공학연구실) ;
  • 이진애 (인제대학교 환경시스템학부)
  • Published : 2002.09.30


The standing crop of genus Microcystis, microcystin concentrations and environmental factors were monitored at stations of the lower reaches of the Nakdong River in 1998 and 1999 during the periods of its occurrence. The Microcystis were observed from May to Octorber, and the cell density was highest at Station Seonam up to 250,000 cells${\cdot}ml^{-1}$ forming scum over the water surface. There were signigicant relationships between the standing crop of Microcystis and nitrate nitrogen, total phosphorus concentrations and Ph. Presumably these parameters were important in the succession to Microcystis dominated phytoplankton community in the summer period in the river. However, Ammonium nitrogen, phosphate phosphorus concentrations and N/P ratio were not critical factors. The Microcystis bloom was notable above $25^{\circ}C$ of surface water temperature. Microcystins were detected from May to November in the algal materials from the river. The 84.2% of algal materials with Microcystis exhibited the microcystin with the maximum of 1711.8 ${\mu}g{\cdot}g^{-1}$ dw. The microcystin concentrations in the algal materials were significantly related to the stading crop of Microcystis, which was the primary determinant factor in the toxin levle of algal materials. The concentrations were also significantly related to pH of the water column in the positive pattern.



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