Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Time Lags between Hydrological Variables and Phytoplankton Biomass Responses in a Regulated River (the Nakdong River)

  • Kim, Myoung-Chul (Han-River Environmental Research Center, National Institute of Environmental Research, Ministry of Environment) ;
  • Jeong, Kwang-Seuk (Department of Biological Science, Pusan National University) ;
  • Kang, Du-Kee (Department of Civil Engineering, Pusan National University) ;
  • Kim, Dong-Kyun (School of Computer Science & Engineering, Seoul National University) ;
  • Shin, Hyun-Suk (Department of Civil Engineering, Pusan National University) ;
  • Joo, Gea-Jae (Department of Biological Science, Pusan National University)
  • Published : 2009.11.30
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Abstract

This study describes time lag responses between hydrological variables and phytoplankton biomass in a regulated river system, the lower Nakdong River in South Korea. The lower Nakdong is a typical flow-controlled lotic system, and its limnological characteristics are influenced by climatic variation such as monsoons and summer typhoons. Mean rainfall in the area during summer is about 1,200 mm, which comprises >60% of annual rainfall. Our results show that the regulation of flow in the Nakdong by multi-purpose dams from 1995 to 2004 affected phytoplankton dynamics. Diatom blooms occurred in winter, when the limited discharge allowed for proliferation of the phytoplankton community. Using multiple regression analysis, we detected significant time-delayed relationships between hydrological variables and phytoplankton biomass. These results may be useful for water resource managers, and suggest that 'smart flow' control would improve water quality in large regulated river systems of the Republic of Korea.

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References

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