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KMID : 1024520010100040259
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Journal of the Environmental Sciences
2001 Volume.10 No. 4 p.259 ~ p.267
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Seasonal Variation in the Phytoplankton and Bacterial Fauna in the Mid to Lower Reaches of the Nakdong River
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Park Jae-Rim
Ha Kyong
Son Yoen-Ju
Joo Gea-Jae
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Abstract
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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}$11.5 {\el}l$, CFUs : ) 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.
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KEYWORD
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Bacteria, phytoplankton, nakdong River, seasonal variation, viable counts
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