播磨灘南西域におけるＣｈａｔｔｏｎｅｌｌａ　ａｎｔｉｑｕａの高密度発生と水質，気象要因等との関係

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  • Relationship between the Bloom of Chattonella antiqua (Hada) Ono and the Water Quality or Meteorological Factors.
  • ハリマナダ ナンセイイキ ニ オケル Chattonella antiqua ノ コウミツド ハッセイ ト スイシツ キショウ ヨウイン トウ ト ノ カンケイ

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The relationship between the bloom of Chattonella antiqua and water quality or meteorological factors was examined in the southwest part of Harima-nada, by referring to the Meteorological Agency's data (1986-1988). In early August 1986, C. antiqua with comparatively high density of cells occurred in the water with low DIN (dissolved inorganic nitrogen), DIP (dissolved inorganic phosphorus), and DIN×DIP, and high DON (dissolved organic nitrogen) : DIN, DOP (dissolved organic phosphorus) : DIP, TN (total nitrogen) : DIN, and TP (total phosphorus) : DIP ratios. Then, high density plankton which formed a red tide occurred in the water with low DIN, DIP, and DIN×DIP, and a high DIN : DIP ratio. This occurred in early August 1987 when the meteorological conditions showed high precipitation and low air temperature in mid July, and long sunshine duration and high air temperature in late July. These characteristics of water quality and meteorological factors suggest that the abnormal occurrence of C. antiqua was closely related to a sudden increase in diatoms due to marked rainfall, the subsequent intense consumption of nutrient salts by these plankton, and the utilization of very low concentrations of nutrient salts by C. antiqua.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 65 (4), 665-672, 1999

    公益社団法人 日本水産学会

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