細菌寄生性及び細菌捕食性微生物の沿岸海域での分布〔英文〕

概要

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Distribution of bacterial parasites and predators, which are enumerated as the plaque-forming units (PEU) and MPN of bacterivorous protozoa respectively, was investigated in the coastal seawater, sediments, plankton, shellfish and on the surface of seaweed. Plaque-forming organisms including bdellovibrio, myxobacteria and amoebae were found in most of the sampleas and their density was affected by both the quality and quantity of bacterial inhabitants. The number of bacterivorous protozoa, flagellates and ciliates, was enumerated by the cultural MPN method established by the authors. Flagellates occurred in most of the samples, but ciliates were observed only in a part of the surface seawater and seaweed. Their distribution was affected by the quantity of prey bacteria. According to statistical analysis, thresholds for growth response or continuance of parasites and predators were found at 102-103 per ml as total viable bacteria.
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