Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Study on the Correlation between the Harmful Cyanobacterial Density and Phycocyanin Concentration at Recreational Sites in Nakdong River

낙동강 친수활동구간 유해 남조류 분포와 피코시아닌(Phycocyanin) 농도 상관성에 관한 연구

  • Hyo-Jin Kim (Busan Metropolitan City Institute of Health & Environment) ;
  • Min-Kyeong Kim (Busan Metropolitan City Institute of Health & Environment)
  • 김효진 (부산광역시 보건환경연구원) ;
  • 김민경 (부산광역시 보건환경연구원)
  • Received : 2023.09.19
  • Accepted : 2023.11.20
  • Published : 2023.11.30
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Abstract

Harmful cyanobacterial monitoring is time-consuming and requires skilled professionals. Recently, Phycocyanin, the accessory pigment unique to freshwater cyanobacteria, has been proposed as an indicator for the presence of cyanobacteria, with the advantage of rapid and simple measurement. The purpose of this research was to evaluate the correlation between the harmful cyanobacterial cell density and the concentration of phycocyanin and to consider how to use the real-time water quality monitoring system for algae bloom monitoring. In the downstream of the Nakdong River, Microcystis spp. showed maximum cell density (99 %) in harmful cyanobacteria (four target genera). A strong correlation between phycocyanin(measured in the laboratory) concentrations and harmful cyanobacterial cell density was observed (r = 0.90, p < 0.001), while a weaker relationship (r = 0.65, p < 0.001) resulted between chlorophyll a concentration and harmful cyanobacterial cell density. As a result of comparing the phycocyanin concentration (measured in submersible fluorescence sensor) and harmful cyanobacterial cell density, the error range increased as the number of cyanobacteria cells increased. Before opening the estuary bank, the diurnal variations of phycocyanin concentrations did not mix by depth, and in the case of the surface layer, a pattern of increase and decrease over time was shown. This study is the result of analysis when Microcystis spp. is dominant in downstream of Nakdong River in summer, therefore the correlation between the harmful cyanobacteria density and phycocyanin concentrations should be more generalized through spatio-temporal expansion.

Keywords

Acknowledgement

The authors are grateful to the Republic of Korea National Institute of Environmental Research (NIER) who funded the research reported in this paper.

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