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ALGAE > Volume 17(4); 2002 > Article
ALGAE 2002;17(4): 267-273. doi: https://doi.org/10.4490/ALGAE.2002.17.4.267
Seasonal Variation of Phytoplankton Community in the Naktong River
Jung Ho Lee, Jung Nam Kwon, Sang Yong Yang
Department of Biology Education, Daegu University, Nakdong River Water Environment Laboratory, National Institute of Environmental Research
A seasonal variation of phytoplankton community in the Naktong River was studied in seven sampling stations at monthly intervals from April 2000 to March 2001. Environmental factors such as conductivity, total phosphorus, total nitrogen and BOD were much higher at a lower reaches than the upper reaches. Especially, they rapidly increased at the st. 4 located near the discharge of the Kumho River. Total 239 taxa observed in the study were classified into 201 species, 22 varieties, 2 forma, 1 morphotype and 13 unidentified species belonging to 102 genera, 39 families, 17 orders and 8 classes. The phytoplankton standing crops were recorded a maximum of 33,389 cells?ml-1 at the st. 7 in June and a minimum of 139 cells?ml-1 at the st. 1 in September. The correlations between averages of the phytoplankton standing crops and some of environmental factors were investigated at each sampling station. The coefficients of correlation between average of the phytoplankton standing crops and BOD, T-N and T-P were 0.61, 0.45 and 0.47, respectively. In general the dominant species were Achnanthes minutissima Kutz, Nitzschia fonticola Grun., Navicula cryptotenella lange-B in the upper reaches, Microcystis aeruginosa (Kutz.) Kutz. and Stephanodiscus hantzschii Grun. in the lower reaches.
Key words: environmental factors, Microcystis, Naktong River, phytoplankton

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