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Summer pattern of phytoplankton distribution at a station in jangmok bay

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Daily changes in phytoplankton abundance and species composition were monitored from July to September 2003 (n=47) to understand which factors control the abundance at a station in Jangmok Bay. During the study, the phytoplankton community was mainly composed of small cell diatoms and dinoflagellates, and the dominant genera wereChaetoceros,Nitzschia, Skeletonema andThalassionema. Phytoplankton abundance varied significantly from 6.40x104 to 1.22x107 cells/l. The initially high level of phytoplankton abundance was dominated by diatoms, but replacement by dinoflagellates started when the N/P ratio decreased to < 5.0. On the basis of the N/P and Si/N ratios, the sampling period could be divided into two: an inorganic silicate limitation period (ISLP, 14th July-12th of August) and an inorganic nitrogen limitation period (INLP, 13th of August - the end of the study). Phosphate might not limit the growth of phytoplankton assemblages in the bay during the study period. This study suggests that phytoplankton abundance and species composition might be affected by the concentrations of inorganic nutrients (N and Si), and provides baseline information for further studies on plankton dynamics in Jangmok Bay.

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Correspondence to Won Je Lee or Kyoungsoon Shin or Pung-Guk Jang or Min-Chul Jang or Nam Joo Park.

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Lee, W.J., Shin, K., Jang, P. et al. Summer pattern of phytoplankton distribution at a station in jangmok bay. Ocean Sci. J. 40, 1–9 (2005). https://doi.org/10.1007/BF03022605

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Key words

  • inorganic nutrients
  • silicate limitation
  • nitrogen limitation
  • phytoplankton