Abstract
The numbers of heterotrophic bacteria in the subarctic coastal seawater of Funka Bay, Japan, were mea- sured by flow cytometry, and 2 different bacterial assem- blages were detected: cells with low DNA content (Group I) and cells with high DNA content (Group II). Although the abundances of both Group I and Group II bacteria showed similar regression slopes against seawater temperature (p > 0.7), Group II bacteria consisted of high growth capacity cells, growing actively in an enriched incubation experiment, whereas Group I bacteria consisted of inactive cells, not responding to an enriched environment. The seasonal varia- tion of the total bacterial abundance observed in Funka Bay was caused almost exclusively by Group II bacteria.
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