Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Phytoplankton Distribution in the Eastern Part of the Yellow Sea by the Formation of Tidal Front and Upwelling during Summer

황해 동부 해역에서 하계에 조석전선과 용승에 의한 식물플랑크톤군집 분포

  • Lee, Young-Ju (Department of Oceanography, College of Natural Science Inha University) ;
  • Choi, Joong-Ki (Department of Oceanography, College of Natural Science Inha University) ;
  • Shon, Jae-Kyoung (West Sea Fisheries Research Institute, NFRDI)
  • 이영주 (인하대학교 자연과학대학 해양학과) ;
  • 최중기 (인하대학교 자연과학대학 해양학과) ;
  • 손재경 (국립수산과학원 서해수산연구소 자원환경과)
  • Received : 2012.03.07
  • Accepted : 2012.04.17
  • Published : 2012.06.30
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Abstract

To understand the phytoplankton community in the eastern part of the Yellow Sea (EYS), in the summer, field survey was conducted at 25 stations in June 2009, and water samples were analyzed using a epifluorescence microscopy, flow cytometry and HPLC method. The EYS could be divided into four areas by a cluster analysis, using phytoplankton group abundances: coastal mixing area, Anma-do area, transition water, and the central Yellow Sea. In the coastal mixing area, water column was well mixed vertically, and phytoplankton was dominated by diatoms, chrysophytes, dinoflagellates and nanoflagellates, showing high abundance ($>10^5\;cells\;l^{-1}$). In Anma-do coastal waters characterized by high dominance of dinoflagellates, high phytoplankton abundance and biomass separated from other coastal mixing area. The southeastern upwelling area was expanded from Jin-do to Heuksan-do, by a tidal mixing and coastal upwelling in the southern area of Manjae-do, and phytoplankton was dominated by benthic diatoms, nanoflagellates and Synechococcus group in this area. Phytoplankton abundance and biomass dominated by pico- and nanophytoplankton were low values in the transition waters and the central Yellow Sea. In the surface of the central Yellow Sea, high dominance of photosynthetic pigments, 19'-hexanoyloxyfucoxanthin and zeaxanthin implies that haptophytes and cyanobacteria could be the dominant group during the summer. These results indicate that the phytoplankton communities in the EYS were significantly affected by the formation of tidal front, thermal stratification, and coastal upwelling showing the differences of physical and chemical characteristics during the summer.

Keywords

References

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