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Fluctuations of the red tide flagellates Chattonella spp. (Raphidophyceae) and the algicidal bacterium Cytophaga sp. in the Seto Inland Sea, Japan
Imai, I.; Sunahara, T.; Nishikawa, T.; Hori, Y.; Kondo, R.; Hiroishi, S. (2001). Fluctuations of the red tide flagellates Chattonella spp. (Raphidophyceae) and the algicidal bacterium Cytophaga sp. in the Seto Inland Sea, Japan. Mar. Biol. (Berl.) 138(5): 1043-1049.
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
Peer reviewed article  

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  • Imai, I.
  • Sunahara, T.
  • Nishikawa, T.
  • Hori, Y.
  • Kondo, R.
  • Hiroishi, S.

    A marine algicidal gliding bacterium Cytophaga?sp. strain?J18/M01 was isolated in 1990 from a station in northern Harima-Nada, the Seto Inland Sea, Japan, using the harmful red tide alga Chattonella antiqua (Hada) Ono as a susceptible organism. The bacterium can prey upon various species of microalgae. Temporal fluctuations of this bacterium and Chattonella spp. [C. antiqua and C. marina (Subrahmanyan) Hara et Chihara] were investigated weekly at the above station in the summer of 1997 and 1998, using immunofluorescence assay employing highly specific polyclonal antibodies for the bacterium. In the summer of 1997, the cell density of Chattonella?spp. showed a maximum value (70?cells?ml-1) on 8 July, and decreased thereafter. The bacterium Cytophaga?sp.?J18/M01 was commonly detected around a few hundreds of cells per milliliter or less. The number of Cytophaga?sp.?J18/M01 increased after the peak of Chattonella?spp., and the maximum cell number of the bacterium was 1350?ml-1. This algicidal bacterium also followed the changes of total amounts of microalgal biomass (chlorophyll?a+pheophytin) when Chattonella?spp. were absent. In the summer of 1998, Chattonella?spp. were relatively less abundant (maximum 21?cells?ml-1), and the algicidal bacterium Cytophaga?sp.?J18/M01 showed a close relationship with the change of total microalgal biomass. The present study suggests that the algicidal bacterium Cytophaga?sp.?J18/M01 preyed upon, not only harmful red tide microalgae, but also other common microalgae such as diatoms, and the bacterium presumably plays an important role in regulating microalgal biomass in natural marine environments.

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