Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Succession of Cyanobacterial Species and Taxonomical Characteristics of Dolichospermum spp. (Nostocales, Cyanophyceae) in the Weir Regions of the Nakdong River

낙동강 보 구간에서 남조류의 천이 및 Dolichospermum 속(Nostocales, Cyanophyceae)의 분류학적 고찰

  • Ryu, Hui-Seong (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Shin, Ra-Young (Department of Biology Education, Daegu University) ;
  • Seo, Kyung-Ae (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Jung-Ho (Department of Biology Education, Daegu University) ;
  • Kim, Kyunghyun (Yeongsan River Environment Research Center, National Institute of Environmental Research)
  • 류희성 (국립환경과학원 영산강물환경연구소) ;
  • 신라영 (대구대학교 생물교육전공) ;
  • 서경애 (국립환경과학원 영산강물환경연구소) ;
  • 이정호 (대구대학교 생물교육전공) ;
  • 김경현 (국립환경과학원 영산강물환경연구소)
  • Received : 2018.08.10
  • Accepted : 2018.09.17
  • Published : 2018.09.30
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Abstract

Freshwater cyanobacterial genus Dolichospermum is one of the most commonly spotted types of phytoplankton, whereas a limited number of studies on morphology of Dolichospermum spp. have been performed in South Korea. The purpose of this study is to investigate the succession pattern of cyanobacteria after weir construction, as well as morphological characteristics of Dolichospermum spp. from natural samples collected in the weir regions of Nakdong River. A total of 31 cyanobacterial taxa observed in this study were classified as belonging to 15 genera, 5 families, and 3 orders. Among them, morphological characteristics in the four species were classified into genus Dolichospermum, for most of the planktic former members of the genus Anabaena, were observed through light microscopy. Water bloom frequently occurred in the middle region of Nakdong River, the maximum number of cyanobacterial species appeared in the lower region of Nakdong River. The appearance of order Chrooccocales was only observed during summer when population density of Microcystis aeruginosa reached an annual peak. In contrast, filamentous cyanobacteria was observed throughout the whole year, even if when water temperature was lower than $5^{\circ}C$. It implied that the low-temperature-adapted filamentous cyanobacteria can grow in a range of water temperatures. Coil diameter of D. crassum from natural samples was $75{\sim}140{\mu}m$ ($ave.=91.3{\mu}m$; n = 94), slightly larger than those reported by previous studies. Dolichospemum smithii ($Kom{\grave{a}}rek$) Wacklin et al. 2009, was described for the first time in Nakdong River.

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References

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