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Community structure of microorganisms associated with reddish-brown iron-rich snow

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Title: Community structure of microorganisms associated with reddish-brown iron-rich snow
Authors: Kojima, Hisaya Browse this author →KAKEN DB
Fukuhara, Haruo Browse this author
Fukui, Manabu Browse this author
Keywords: Microbial community
Snow coverage
Issue Date: Sep-2009
Publisher: Elsevier GmbH
Journal Title: Systematic and Applied Microbiology
Volume: 32
Issue: 6
Start Page: 429
End Page: 437
Publisher DOI: 10.1016/j.syapm.2009.06.003
PMID: 19560891
Abstract: Reddish-brown colored snow, containing spherical brown particles, is observed in several mires in Japan. In order to characterize this remarkable phenomenon, the microbial community and chemical species in snow were analyzed. A core sample of snow which had colored region was investigated to reveal vertical shifts in physicochemical characteristics and the microbial community structure. The abundance of particle peaked within the colored layer, and correlated with the amount of reducible Fe(III). The interstitial water of colored layer was enriched with Fe(II), and characterized by reduced concentration of dissolved methane. The bacterial community in the colored region was characterized by higher relative abundance of iron-reducing bacteria and methanotrophs. Aggregates of the brown particles were found as precipitates in snow melt pools, and subjected to cloning analyses targeting several different genes. The majority of bacterial 16S rRNA gene clones belonged to the class Betaproteobacteria or the phylum Bacteroidetes. No snow algae were detected in the eukaryotic small subunit rRNA gene clone library. As a possible carbon source to sustain the community in the snow, involvements of carbon dioxide and methane were investigated by analyzing the genes involved in assimilation of these. In the analyses of genes for ribulose-1,5-biphosphate carboxylase/oxygenase, clones related to sulfur oxidizers were obtained. The analysis or particulate methane monooxygenase genes indicated dominance of Methylobacter species. These results emphasized the uniqueness of this phenomenon, and iron reducers of the genus Geobacter are suggested to be the key organisms that can be investigated to understand the mechanism of this phenomenon.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小島 久弥

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