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Tempo-spatial patterns of bacterial community composition in the western North Pacific Ocean

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Title: Tempo-spatial patterns of bacterial community composition in the western North Pacific Ocean
Authors: Kataoka, Takafumi Browse this author
Hodoki, Yoshikuni Browse this author
Suzuki, Koji Browse this author
Saito, Hiroaki Browse this author
Higashi, Seigo Browse this author
Keywords: Marine bacteria
Phylotype
DGGE
Oyashio
Kuroshio
Pacific Ocean
Issue Date: Apr-2009
Publisher: Elsevier B.V.
Journal Title: Journal of Marine Systems
Volume: 77
Issue: 1-2
Start Page: 197
End Page: 207
Publisher DOI: 10.1016/j.jmarsys.2008.12.006
Abstract: In the western North Pacific, where subarctic Oyashio waters encounter subtropical Kuroshio waters, phylotype composition of heterotrophic bacteria was estimated by denaturing gradient gel electrophoresis (DGGE) of PCR-amplified bacterial 16S ribosomal DNA. Total bacterial abundance was also measured by flow cytometry. The study area was divided into four water masses: coastal, Oyashio, Kuroshio, and the Kuroshio-Oyashio transition. Abundances of heterotrophic bacteria in the Oyashio, Kuroshio, and Kuroshio-Oyashio transition regions ranged from 0.2 x 10^[5] cells mL^[-1] to 1.4 x 10^[5] cells mL^[-1] and were not significantly different, except in the Oyashio region during September. Bacterial compositions were distinct in each water mass. Furthermore, phylotype distributions differed between surface and subsurface waters in the Kuroshio-Oyashio transition region. Out of 61 DGGE bands obtained, 41 were successfully identified as 31 phylotypes: 22 Gammaproteobacteria, 4 Alphaproteobacteria, 2 unknown bacteria, 2 cyanobacteria, and 1 plastid. Although the Gammaproteobacteria OM60 clade was eurytopic in the study area, Psychrobacter glacincola and the uncultured Gammaproteobacteria SAR92 clade were often observed in the Oyashio region. Overall, our results indicated that Gammaproteobacteria were predominant in the bacterial community, which was influenced by the hydrographic properties of each water mass in the study area.
Type: article (author version)
URI: http://hdl.handle.net/2115/39306
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 東 正剛

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