Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Characteristics of Horizontal Community Distribution and Nutrient Limitation on Growth Rate of Phytoplankton during a Winter in Gwangyang Bay, Korea

동계 광양만에서 식물플랑크톤 군집구조의 수평적 분포특성과 성장에 미치는 영양염 제한 특성

  • 백승호 (한국해양연구원 남해연구소) ;
  • 김동선 (한국해양연구원 기후.연안재해연구부) ;
  • 현봉길 (한국해양연구원 남해연구소) ;
  • 최현우 (한국해양연구원 해양자료정보사업단) ;
  • 김영옥 (한국해양연구원 남해연구소)
  • Received : 2010.07.29
  • Accepted : 2011.05.04
  • Published : 2011.06.30
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Abstract

To estimate the effects of limitation nutrients for phytoplankton growth and its influences on short-term variations of a winter phytoplankton community structure, we investigated the abiotic and biotic factors of surface and bottom waters at 20 stations of inner and offshore areas from 6 to 7 February in Gwangyang Bay, Korea. Also, several algal bio-assay studies were conducted to identify any additional nutrient effects on phytoplankton assemblage using surface water for the assay. The dominant species in the bay was diatom Skeletonema costatum, which occupied more than 70% of total species in most stations (St.1-16) of the inner bay. According to a cluster and multidimensional scaling (MDS) analysis based on phytoplankton community data from each station, the bay was divided into three groups. The first group included stations from the south-western parts of Myodo lsland, which can be characterized as a semien-closed eutrophic area with high phytoplankton abundance. The second group included most stations from the north-eastern part of Myodo lsland, influenced indirectly by surface water currents from offshore of the bay. The standing phytoplankton crops were lower than those of the first group. The other cluster was restricted to samples collected from offshore of the bay. In the bay, silicon (Si) and phosphorus (P) were not a major limiting factor for phytoplankton production. However, since the DIN: DIP and DSi: DIN ratios clearly demonstrated that there were potential stoichiometric N limitations, nitrogen (N) was considered as a limiting factor. Based on the algal bio-assay, in vivo fluorescence values in N (+) added experiments were higher compared to control and P added experiments. Our results suggested that nitrogen may act as one of the most important factors in controlling primary production during winter in Gwangyang Bay.

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References

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