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Seasonal fluctuations of cell density of cyanobacteria and other picophytoplankton in Iwanai Bay, Hokkaido, Japan

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Abstract

In Iwanai Bay, which is located on the Japan Sea coast in Hokkaido, seasonal fluctuations in cell densities of phycoerythrin-dominant cyanobacteria and chlorophyll-dominant, other picophytoplankton were examined. Cell densities of cyanobacteria and other picophytoplankton ranged from 1.4×105 to 1.9×108 and from 4.0×104 to 4.3×106 cells 1−1, respectively. The cell densities of both groups tended to increase after spring diatom bloom with remarkable fluctuations from June to August. This tendency was caused by the vertical distributions of both groups. The maximum density layer shifted from 0–20 m depth in April–June to 20–50 m depth in August–October. Cyanobacteria were dominant in picophytoplankton community which accounted for 73–99% of the total cell density during the whole year. Present results show that the picophytoplankton community in Iwanai Bay was influenced by a single water mass system (Tsushima Warm Current) during the whole year.

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Author notes

  1. Akira Miyazono

    Present address: Hokkaido Abashiri Fishery Experimental Station, 31 Masuura, 099-31, Abashiri, Japan

  2. Tsuneo Odate

    Present address: Biological Oceanography, Faculty of Bioresources, Mie University, 1515 Kamihama-cho, 514, Tsu, Japan

Authors and Affiliations

  1. Hokkaido Nuclear Energy Environmental Research Center, 045-01, Miyaoka, Kyowa, Japan

    Akira Miyazono

  2. Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University, 3-1-1, Minato-cho, 041, Hakodate, Japan

    Tsuneo Odate

  3. Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University, 3-1-1, Minato-cho, 041, Hakodate, Japan

    Yoshiaki Maita

Authors
  1. Akira Miyazono
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  2. Tsuneo Odate
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  3. Yoshiaki Maita
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Additional information

This is contribution No. 254 from the Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University.

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Miyazono, A., Odate, T. & Maita, Y. Seasonal fluctuations of cell density of cyanobacteria and other picophytoplankton in Iwanai Bay, Hokkaido, Japan. J Oceanogr 48, 257–266 (1992). https://doi.org/10.1007/BF02233986

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  • DOI: https://doi.org/10.1007/BF02233986

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