Dynamics of Epilithic Diatom Communities and Biological Water Quality Assessment in Geum River and Downstream Yongdam

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Research article

Journal of the Korean Society for Environmental Analysis 2017;20(3):138-144.

금강과 용담댐 하류하천 부착규조 군집 동태 및 생물학적 수질 평가

박연정¹, 김한순¹, 반양진², 이희숙²

¹경북대학교
²한국수자원공사

Abstract

This study was conducted to investigate the water quality of the Geum River and downstream Yongdam using Diatom Assemblage Index to organic water pollution (DAIpo) and Trophic Diatom Index (TDI). Water quality parameters, such as Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Total Phosphorus (TP), were analyzed. A total of 99 diatom taxa belonging 27 genera and 75 diatom taxa belonging 25 genera were identified in the epilithic diatom communities of Geum River and downstream Yongdam, respectively. In Geum River, the dominant species were indifferent and saprophilous taxa, such as Achnanthes minutissima, Fragilaria crotonensis, Nitzschia inconspicua, Nitzschia palea, and Cyclotella atomus. However, the dominant species were in indifferent and saproxenous taxa, such as Achnanthes minutissima, Cocconeis placentula var. lineata, and Reimeria sinuata in downstream Yongdam. The mean biological indices (DAIpo and TDI) indicated poor water quality in Geum River but good water quality in downstream Yongdam.

Key Words: Epilithic diatom communities, DAIpo, TDI