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The Korean Society of Phycology (한국조류학회(藻類))
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Evaluation of Diatom Growth Potential in Midstream and DownstreamNakdong River

낙동강 중. 하류에서의 규조류 성장잠재력 평가

  • Kwon, Young-Ho (Nakdong River Environment Research Center National Institute of Environmental Research) ;
  • Seo, Jung-Kwan (Nakdong River Environment Research Center National Institute of Environmental Research) ;
  • Park, Sang-Won (Department of Environmental Science Keimyung University) ;
  • Yang, Sang-Yong (Nakdong River Environment Research Center National Institute of Environmental Research)
  • 권영호 (국립환경과학원 낙동강물환경연구소) ;
  • 서정관 (국립환경과학원 낙동강물환경연구소) ;
  • 박상원 (계명대학교 환경과학과) ;
  • 양상용 (국립환경과학원 낙동강물환경연구소)
  • Published : 2006.06.30
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Abstract

For the test organism of algal growth potential (AGP), the diatom in the genus Stephanodiscus which cause blooms in the Nakdong River was used instead of generally used strains of Selenastrum, Microcystis, or Anabaena. AGP results indicated that all the samples in the Nakdong River except for that from the Nakdan Bridge site were eutrophic state. Furthermore, the sample from Kumho River site was hypertrophic state. In the main stream Nakdong River, the value of AGP was lowest at the upstream Nakdan Bridge site and was highest at Koryoung Bridge site which is just downstream of Kumho River confluent point indicating the seriousness of pollution contributed by the Kumho River to the Nakdong River. Changes in the concentration of nutrients before and after the AGP tests and inter-relationship among the nutrients indicated that the growth of the Stephanodiscus in the AGP tests were mostly affected by the nitrate, silicate and phosphate. The limiting nutrient was identified by the nutrient addition experiments and the results showed that phosphate was the limiting nutrient for the growth of Stephanodiscus in the tested samples.

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References

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  2. Spatiotemporal and Longitudinal Variability of Hydro-meteorology, Basic Water Quality and Dominant Algal Assemblages in the Eight Weir Pools of Regulated River (Nakdong) vol.51, pp.4, 2018, https://doi.org/10.11614/KSL.2018.51.4.268