Journal of Species Research

  • 제14권4호
  • /
  • Pages.434-442
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  • 2025
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  • 2234-7909(pISSN)
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  • 2713-8615(eISSN)
국립생물자원관 (The National Institute of Biological Resources)
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First record of Dolichospermum mucosum(Nostocales, Cyanobacteria) in Korea: A study from the Han River

  • Hye Jeong Choi (Environmental Research Institute, Kangwon National University) ;
  • Chong-Sung Park (Water Resources Research Division, National Institute of Environmental Research) ;
  • Seungyun Lee (Department of Environmental Science, Kangwon National University) ;
  • Eun-Mi Hong (Department of Environmental Science, Kangwon National University)
  • 투고 : 2025.03.25
  • 심사 : 2025.06.11
  • 발행 : 2025.11.30
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초록

The heterocytous cyanobacterium Dolichospermum mucosum was observed in Cheongpyeong Lake, located in the mid-to-downstream region of the North Han River. This species is morphologically characterized by irregularly and circularly coiled trichomes, which are consistently surrounded by a transparent mucilaginous envelope at a distance of 19.8±11.3 ㎛. Akinetes were solitary, nearly spherical, and positioned at a distance from the heterocysts, with a width-to-length ratio of 1.1±0.2. In phylogenetic analyses based on the 16S rRNA and rbcLX genes, this strain clustered within the same clade as previously reported D. mucosum. However, in the phylogenetic analysis, it grouped mostly closely with D. smithii, which exhibited the highest nucleotide sequence similarity. Structural variations in Box-B and V3 helices enabled clear differentiation between D. mucosum and D. smithii. Based on these morphological and phylogenetic characteristics, the Dolichospermum strain was identified as D. mucosum, marking its first recorded occurrence in the Republic of Korea.

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과제정보

This work was supported by a grant from the Nakdonggang National Institute of Biological Resources (NNIBR 20251103), funded by the Ministry of Environment (MOE) of the Republic of Korea (Study of Microalgae Diversity from the Freshwater of Korea -Vol. III(4)-).

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