Abstract

It was found by the use of a chemostat that the composition of bacterial populations in natural sea water is dependent on the concentration of dissolved organic substances. When the chemostat was charged with filter-sterilized polluted sea water which contained organic substances in high concentration, bacteria belonging to the genus Acinetobacter were predominant. However, when it was charged with clean sea water containing organic substances in low concentration the genus Vibrio became predominant. These results may, at least partly, explain the reason why Acinetobacter is the dominant genus in polluted sea water in Osaka Bay.1)

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