Effects of nitrogen and phosphorus sources on the utilization and growth kinetics of the harmful dinoflagellate Cochlodinium polykrikoides isolated from Yatsushiro Sea, Japan

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  • KIM DAE-IL
    Ocean Environmental System Program, Faculty of Marine Technology, Chonnam National University
  • MATSUBARA TADASHI
    Laboratory of Marine Environmental Science, Bioscience and Biotechnology, Kyushu University
  • OH SEOK JIN
    Laboratory of Marine Environmental Science, Bioscience and Biotechnology, Kyushu University
  • SHIMASAKI YOHEI
    Laboratory of Marine Environmental Science, Bioscience and Biotechnology, Kyushu University
  • OSHIMA YUJI
    Laboratory of Marine Environmental Science, Bioscience and Biotechnology, Kyushu University
  • HONJO TSUNEO
    Laboratory of Marine Environmental Science, Bioscience and Biotechnology, Kyushu University

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Other Title
  • 八代海から単離した有害渦鞭毛藻　Ｃｏｃｈｌｏｄｉｎｉｕｍ　ｐｏｌｙｋｒｉｋｏｉｄｅｓ　の栄養塩利用特性と増殖動力学
  • ヤツシロカイ カラ タンリシタ ユウガイ カベンモウソウ Cochlodinium polykrikoides ノ エイヨウエン リヨウ トクセイ ト ゾウショク ドウリキガク

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Abstract

  The effects of various inorganic and organic nitrogen (N) and phosphorus (P) sources on the utilization and growth kinetics of the harmful dinoflagellate Cochlodinium polykrikoides Margalef, which was isolated from the Yatsushiro Sea of Japan, were experimentally investigated. C. polykrikoides was able to grow actively with inorganic nitrogen compounds and to grow at a slower rate on organic nitrogen compounds, urea and amino acid glycine, as N-sources. On the other hand, this organism was able to effectively utilize a variety of both inorganic and organic phosphorus compounds as P sources. Specific maximum growth rate (μ′m) and minimum cell quota (Q0), which were obtained by semi-continuous growth experiments, were 0.48 day-1 and 5.25 pmol cell-1 under N-limited steady-state conditions, and 0.54 day-1 and 0.37 pmol cell-1 under P-limited steady-state conditions. Based on the physiological characteristics obtained in the present study, C. polykrikoides may have advantages for species competition.<br>

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