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Influences of benthic infaunal burrows on community structure and activity of ammonia-oxidizing bacteria in intertidal sediments

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Title: Influences of benthic infaunal burrows on community structure and activity of ammonia-oxidizing bacteria in intertidal sediments
Authors: Satoh, Hisashi Browse this author
Nakamura, Yoshiyuki Browse this author
Okabe, Satoshi Browse this author
Keywords: benthic infaunal burrows
ammonia-oxidizing bacteria
intertidal sediments
Issue Date: Feb-2007
Publisher: American Society for Microbiology
Journal Title: Applied and Environmental Microbiology
Volume: 73
Issue: 4
Start Page: 1341
End Page: 1348
Publisher DOI: 10.1128/AEM.02073-06
Abstract: Influences of benthic infaunal burrows constructed by the polychaete (Tylorrhynchus heterochaetus) on O2 concentrations and community structures and abundances of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) in intertidal sediments were analyzed by the combined use of a 16S rRNA gene-based molecular approach and microelectrodes. The microelectrode measurements performed in an experimental system developed in an aquarium showed direct evidence of O2 transport down to a depth of 350 mm of the sediment through a burrow. The 16S rRNA gene-cloning analysis revealed that the betaproteobacterial AOB communities in the sediment surface and the burrow walls were dominated by Nitrosomonas sp. Nm143-like sequences and most of the clones in Nitrospira-like NOB clone libraries of the sediment surface and the burrow walls were related to the Nitrospira marina lineage. Furthermore, we investigated vertical distributions of AOB and NOB in the infaunal burrow walls and the bulk sediments by real-time quantitative polymerase chain reaction (Q-PCR) assay. The AOB and Nitrospira-like NOB specific 16S rRNA gene copy numbers in the burrow walls were comparable with those in the sediment surfaces. These numbers in the burrow wall at a depth of 50-55 mm from the surface were, however, higher than those in the bulk sediment at the same depth. The microelectrode measurements showed higher NH4+ consumption activity at the burrow wall as compared with those at the surrounding sediment. This result was consistent with the results of microcosm experiments showing that the consumption rates of NH4+ and total inorganic nitrogen increased with increasing infaunal density in the sediment. These results clearly demonstrated that the infaunal burrows stimulated O2 transport into the sediment in which otherwise reducing conditions prevailed, resulting in development of high NH4+ consumption capacity. Consequently, the infaunal burrow became an important site for NH4+ consumption in the intertidal sediment.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 久

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