Algicidal Activity of a Killer Bacterium against the Harmful Red Tide Dinoflagellate Heterocapsa circularisquama Isolated from Ago Bay, Japan.

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  • 英虞湾から分離された海洋細菌ＡＡ８‐２株のＨｅｔｅｒｏｃａｐｓａ　ｃｉｒｃｕｌａｒｉｓｑｕａｍａに対する殺藻性に関する検討
  • 英虞湾から分離された海洋細菌AA8-2株のHeterocapsa circularisquamaに対する殺藻性に関する検討
  • アゴワン カラ ブンリ サレタ カイヨウ サイキン AA8 2カブ ノ Heterocapsa circularisquama ニ タイスル サツソウセイ ニ カンスル ケントウ

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Abstract

Algicidal activity of a bacterium strain Cytophaga sp. AA8-2 against the harmful red tide causing alga Heterocapsa circularisquama was investigated. Physiological conditions of host cells, incubation temperature and existence of ambient organic substrates or co-existing bacteria affected the lethal effect of Cytophaga sp. AA8-2. Bacterial lysis of H. circularisquama was caused more rapidly at higher incubation temperature (20-30°C). Growth of 6 among 7 H. circularisquama strains tested was inhibited by Cytophaga sp. AA8-2, the levels of which were varied. A part of H. circularisquama cells in a culture formed temporary cysts to survive the bacterial attack. The envelope of the temporary cyst of H. circularisquama was composed of a markedly thicker layered structure (209±72nm) than that of the vegetative cell (40±15nm).

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