和歌山県田辺湾と大阪湾における赤潮藻殺藻微生物の分布

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タイトル別名
  • Distributions of the algicidal microorganisms against the harmful phytoflagellates in Tanabe Bay (Wakayama Prefecture) and Osaka Bay, Japan
  • ワカヤマケン タナベワン ト オオサカワン ニ オケル アカシオ ソウサツソウ ビセイブツ ノ ブンプ

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説明

Seasonal fluctuations of killer microorganisms (substantially algicidal bacteria) were investigated with the microplate MPN method in surface seawater and on the surface of the green alga Ulva pertusa in Osaka Bay and Tanabe Bay of Wakayama Prefecture. 　Main species of target red tide oganisms were the raphidophyte Chattonella antiqua and the dinoflagellate Karenia mikimotoi. On the surface of U. pertusa, K. mikimotoi killers (Km-killers) were most abundantly detected with a maximum value of 1.38×106 MPN g-1 (wet weight) and C. antiqua killers (Ca-killers) also showed a high value of 3.60×105 MPN g-1 (wet weight).　In seawater, most part of killer microorganisms was substantially algicidal bacteria, and Km-killers showed the maximum values of 103-104 MPN ml-1 at intertidal seaweed bed and aquaculture pond with abundant U. pertusa.　Km-killers were less abundant in offshore seawater (< 101 MPN mL-1 in Osaka Bay and < 102 MPN mL-1 in Tanabe Bay).　Ca-killers also tended to be a little bit more abundant in seawaters of the coastal seaweed bed. It is suggested that seaweed beds composed of such as Ulva pertusa play an important role for harboring and supplying killer microorganisms to adjacent coastal environments, and contribute to prevent massive developments of harmful algal blooms in the coastal sea.

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