Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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K:Fe Ratio as an Indicator of Cyanobacterial Bloom in a Eutrophic Lake

  • Ahn, Chi-Yong (Environmental Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Dae-Kyun (Environmental Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Hee-Sik (Environmental Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Chung, An-Sik (Department of Biological Sciences, Korea Advanced Institute of Science and Technology) ;
  • Oh, Hee-Mock (Environmental Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology)
  • Published : 2004.04.01
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Abstract

The effects of potassium, sodium, calcium, magnesium, and iron on cyanobacterial bloom potentials were investigated in Daechung Reservoir, Korea. Potassium showed the highest correlation with the cyanobacterial cell number (r=0.487, P<0.05) and phycocyanin concentration (r=0.499, P<0.05). However, it was not likely that the potassium had directly affected the bloom formation, because the variations of its concentration were not significantly large. In contrast, the Fe concentration fluctuated drastically and exhibited a negative correlation with the cyanobacterial cell number (r=- 0.388, P<0.1) and phycocyanin concentration (r=-0.446, P<0.05). Accordingly, the K:Fe atomic ratio would appear to reflect the extent of cyanobacterial bloom more precisely than K or Fe alone. The K:Fe ratio specifically correlated with cyanobacterial percentage, the cyanobacterial cell number and phycocyanin concentration (r=0.840, P<0.001; r=0.416, P<0.05; r=0.522, P<0.01, respectively). With the K:Fe atomic ratio of over 200, the chlorophyll-a concentration, cyanobacterial cell number, and phycocyanin concentration exceeded $10\mu$g $1^{-1}$20,000 cells $ml^{-1}$, and 20 pM, respectively, the general criteria of eutrophic water.

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