Specific Toxic Effect of Dinoflagellate<i>Heterocapsa circularisquama</i>on the Rotifer<i>Brachionus plicatilis</i>

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  • KIM Daekyung
    Division of Biochemistry, Faculty of Fisheries, Nagasaki University
  • SATO Yoji
    Division of Biochemistry, Faculty of Fisheries, Nagasaki University
  • ODA Tatsuya
    Division of Biochemistry, Faculty of Fisheries, Nagasaki University
  • MURAMATSU Tsuyoshi
    Division of Biochemistry, Faculty of Fisheries, Nagasaki University
  • MATSUYAMA Yukihiko
    National Research Institute of Fisheries and Environment of the Inland Sea
  • HONJO Tsuneo
    Faculty of Agriculture Kyushu University

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タイトル別名
  • Specific Toxic Effect of Dinoflagellate Heterocapsa circularisquama on the Rotifer Brachionus plicatilis.
  • Specific toxic effect of Heterocapsa circularisquama dinoflagellate on the rotifer Brachionus plicatilis

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  Heterocapsa circularisquama (Dinophyceae), a noxious red tide dinoflagellate, is known to have a specifically lethal effect on shellfish, especially bivalves such as pearl oyster (Pinctada fucata), but no detrimental effects of this alga on fishes have not been observed so far. In this study, we found that H. circularisquama was toxic to a microzooplankton, a rotifer (Brachionus plicatilis) in a cell concentration-dependent manner, while the cultured supernatant or ultrasonic ruptured H. circularisquama had no significant toxic effect on the rotifer. Since no such toxic effects on the rotifer were observed in Chattonella marina, Heterosigma akashiwo, or Cochlodinium polykrikoides, other species of harmful red tide plankton, H. circularisquama may have a strictly specific toxic mechanism against the rotifer as well as bivalves.<br>

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