Journal of Japan Society on Water Environment
Online ISSN : 1881-3690
Print ISSN : 0916-8958
ISSN-L : 0916-8958
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Volume 34, Issue 8
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Original Paper
  • Annual Changes in the Picoplankton Communities in a Eutrophic Subtropical Pond
    Tomoko HIRATSUKA, Shoichiro SUDA
    Article type: Original Paper
    2011 Volume 34 Issue 8 Pages 103-108
    Published: 2011
    Released on J-STAGE: August 10, 2011
    DOIhttps://doi.org/10.2965/jswe.34.103
    JOURNAL FREE ACCESS
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    Plankton communities and physicochemical factors were investigated to determine annual changes in the picoplankton communities for one year in the eutrophic subtropical Senbaru Pond in Okinawa-jima, Japan. Cyanobacteria dominated in the picoplankton communities throughout the whole year. The cell densities of picoplankton was high (7.52×103-1.03×107 cells·mL-1). The densities showed positive correlations with water temperatures. In particular, the densities increased over 25 degrees. Nutrients were not limiting factors for growth of picoplankton in Senbaru Pond. The values of turbidity were high after the heavy rains because of red soil runoff; however, there were no correlations between the cell densities and the turbidities. It was considered that water temperature rather than nutrients strongly affected the cell density in Senbaru Pond.
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