Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Seasonal Variation in the Phytoplankton and Bacterial Fauna in the Mid to Lower Reaches of the Nakdong River

낙동강 중.하류에서 식물플랑크톤과 세균의 계절적 동태

  • Park, Jae-Rim (Dept. of Environmental Science, Silla University) ;
  • Ha, Kyong (Dept. of Biology, Pusan National University) ;
  • Son, Yeon-Ju (Dept. of Environmental Science, Silla University) ;
  • Ju, Gea-Jae (Dept. of Biology, Pusan National University)
  • 박재림 (신라대학교 환경학과) ;
  • 하경 (부산대학교 생물학과) ;
  • 손연주 (신라대학교 환경학과) ;
  • 주기재 (부산대학교 생물학과)
  • Published : 2001.08.01
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Abstract

Investigations were carried out to observe the seasonal succession of phytoplankton, and viable counts of bacteria from the mid to lower reaches of Nakdong Fiver. An intensive monitoring was conducted from May to December 1999 biweekly at 6 sites in a main channel and 3 tributaries. Although there are several sites with high nutrient loading from the basin, all of study sites showed mesotrophic states owing to high discharge(June~September). Relatively low algal biomass and CFUs(mean of chi. a, $12.3{\pm}$11.5 $\mu\textrm{g}${\el}l$, CFUs : 1.8${\times}10^7$) were observed during the rainy season. The diatom population was dominant(over 85% of total community) year-long with peaks(Stephanodiscus hantzchii) in the fall and winter. Dominance of blue-green algal groups during the summer was not observed in the summer. Microorganisms peaked in the summer and fall(June~September), affected mainly by the inputs of phytoplankton and nutrients. Biomass of phytoplankton and CFU counts were higher in the Kumho River than other tributaries and main channel.

Keywords

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