Journal
MICROBES AND ENVIRONMENTS
Volume 23, Issue 4, Pages 277-284Publisher
JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE
DOI: 10.1264/jsme2.ME08513
Keywords
bacterial community composition; seasonal variation; PCR-DGGE
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Funding
- Agriculture, Forestry and Fisheries Research Council
- Fisheries Research Agency, Japan
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This study investigated seasonal and spatial dynamics of the bacterial community in Gokasho bay with denaturing gradient gel electrophoresis (DGGE) profiles of PCR-amplified 16S rRNA gene fragments. The community structure was related to physico-chemical water conditions in the area examined. The bacterial community clustered into three groups: bacteria collected during January May; those collected from water at the surface in July and September; and those collected from water at the bottom in July and September and from both depths in November. Canonical correspondence analyses indicated that the seasonal variability in bacterial community was associated with water temperature succession. On the other hand, concentrations of particulate organic matter and nitrite plus nitrate were related to the vertical change in community structure in summer and autumn as well as HNF abundance, suggesting that both top-down and bottom-up control affected the community. The influence of salinity was insignificant though bacterial production was related to salinity. No relationship was observed between the variation in community structure and that in hydrolytic enzyme activity. The results indicate that changes in bacterial activity are not coupled with variation in community structure.
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