Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effects of Environmental Factors on Algal Communities in the Nakdong River

낙동강의 환경요인이 조류군집 구성에 미치는 영향

  • Yu, Jae Jeong (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Lee, Hae Jin (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Lee, Kyung-Lak (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Lee, In Jeong (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Jung, Gang Young (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Cheon, Se Uk (Nakdong River Water Environmental Research Center, National Institute of Environmental Research)
  • 유재정 (국립환경과학원 낙동강물환경연구소) ;
  • 이혜진 (국립환경과학원 낙동강물환경연구소) ;
  • 이경락 (국립환경과학원 낙동강물환경연구소) ;
  • 이인정 (국립환경과학원 낙동강물환경연구소) ;
  • 정강영 (국립환경과학원 낙동강물환경연구소) ;
  • 천세억 (국립환경과학원 낙동강물환경연구소)
  • Received : 2014.06.10
  • Accepted : 2014.09.23
  • Published : 2014.09.30
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Abstract

This study was carried out to investigate algal community structures and their correlations with environmental factors on five weir areas in the Nakdong River, South Korea. Water qualities, hydrodynamics, meteorological conditions and algal species compositions were observed in studied sites from May 2010 to Dec. 2013. Results showed that average total phosphorus concentration of 2013 was decreased by 52.4% in comparing with that from 2010 to 2011. Chlorophyll.a concentrations were positive significant with water temperature, pH, total phosphorus and total nitrogen, but is not significant with turbidity and suspended solids. Seasonal successions of algae were observed that Stephanodiscus sp. was dominant species with 65.3% of dominant frequency in studied site. Large algal biomass of the low temperature-adapted diatoms were observed during temperature range of $4{\sim}9^{\circ}C$, but large cyanobacterial biomass mainly during high temperature period ranged from $22^{\circ}C$ to $32^{\circ}C$. Microcystis sp. dominated during high water temperature in summer. The yearly correlations of algal biomass with accumulated solar radiations were not significant but seasonal correlations of summer from June to August were significant with correlation coefficient 0.33 (p<0.05). There were not significant correlations between turbidities and algal biomass. Turbidity and suspended solids concentrations were not significant correlation with algal biomass. According to the results, algal communities had strong correlation with water temperature and had partially correlation with solar radiation. For an effective management of algal blooms, water managers should survey with more long-term monitoring of various environmental factors and algal communities.

Keywords

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