ScholarWorks@경상국립대학교

초록

BACKGROUND: Recently, the inflow of nonpoint pol-lutants into rivers caused by rapid urban and industrializa-tion promotes the proliferation of algae, which causes eu-trophication of rivers. This study was conducted to eval-uate the seasonal variation of water quality characteristics and cryptomonads growth in the Oncheon River. METHODS AND RESULTS: The water quality and dis-tribution characteristics of cryptomonads in the Oncheon River were investigated monthly for 12 months from January 2021. The cell number of cryptomonads was intensively developed in January-April, and it decreased sharply in the summer with heavy rainfall. In particular, cryptomonads moved to the downstream side of the river depending on the time, and as a result, significant differ-ences were shown for each investigation point. The Korean trophic state index (TsiKO) in Oncheon River was classified as eutrophy all year round, indicating that cryp-tomonads can grow year-round. Distribution character-istics of cryptomonads in Oncheon River showed high correlations with DO (r=0.678), BOD (r=0.826) and chlorophyll-a (r=0.613) in water. CONCLUSION(S): In order to reduce cryptomonads in the Oncheon River, it is judged that a complex counter-measure considering the residence time, insolation and precipitation along with water quality factors is required.

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