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Journal of Oceanography

, Volume 51, Issue 3, pp 289–300 | Cite as

Seasonal appearance ofProchlorococcus in Suruga Bay, Japan in 1992–1993

  • A. Shimada
  • M. Nishijima
  • T. Maruyama
Article

Abstract

Seasonal appearance ofProchlorococcus was studied by flow cytometry in Suruga Bay, Japan in 1992–1993.Prochlorococcus cells were in high concentrations (>1×104 cells ml−1) from July to October 1992 and September 1993, when the water temperature was over 20°C. The 16S rRNA of the isolated cells showed 98.5% sequence homology with that ofP. marinus (Sargasso strain), indicating that they are the same species. The former has a high divinyl-chlorophyll (DV-Chl.)a/b ratio similar to the Mediterranean strain and different from the Sargasso strain. Maximum concentration ofProchlorococcus at the surface water was 2.5×104 cells ml−1 in August 1992 and their DV-Chl.a accounted for 4.0% of the total chlorophylla. A decrease in cell density to less than 5×103 cells ml−1 was observed from December to May with an exceptional rise in January 1993. WhileProchlorococcus showed a maximum concentration of 3.6×104 cells ml−1 at 10 m depth in September 1992, phycoerythrin (PE)-richSynechococcus spp. were dominant with their maximum concentration of 2.2×105 cells ml−1 in the same water body. On the other hand, phycocyanin (PC)-richSynechococcus spp. and the larger phytoplankters showed maximum concentrations in the surface waters in May and June. BothProchlorococcus and PE-richSynechococcus showed their lowest concentrations in April. A significant positive correlation was obtained between cell concentrations of the PE-richSynechococcus andProchlorococcus.

Keywords

Japan Surface Water Flow Cytometry Water Temperature Water Body 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Journal of the Oceanographic Society of Japan 1995

Authors and Affiliations

  • A. Shimada
    • 1
  • M. Nishijima
    • 1
  • T. Maruyama
    • 1
  1. 1.Simizu LaboratoriesMarine Biotechnology Institute (MBI)Shimizu-shi, ShizuokaJapan

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