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Microbial communities in the semi-consolidated carbonate sediments from the South West Indian Ridge
Li Jiwei 1 * #,Zhou Huaiyang 2,Peng Xiaotong 2
1.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031
2.School of Ocean and Earth Science, Tongji University, Shanghai 200092
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.New teacher)）
Opened online: 3 May 2013
Accepted by: none
Citation: Li Jiwei,Zhou Huaiyang,Peng Xiaotong.Microbial communities in the semi-consolidated carbonate sediments from the South West Indian Ridge[OL]. [ 3 May 2013] http://en.paper.edu.cn/en_releasepaper/content/4539676
 
 
Semi-consolidated carbonate sediments, which were attached to a film of black ferromanganese oxides on the white carbonates, were collected about 50 km in a western direction from the newly discovered hydrothermal field at the South West Indian Ridge (SWIR). The biodiversity of the prokaryotic communities was examined by the methods of microbiological analysis both in the exterior black oxides and interior white carbonates. The 16S rRNA gene analysis suggested that members of gamma-proteobacteria, Acidobacteria and Thaumarcheota dominated the bacterial and archeal clone libraries, respectively. To aid in further charactering the metabolic process in the microbial community, analysis of amoA (coding the alpha subunit of the ammonia monooxygenase for Archaea) and aprA (coding the alpha subunit of the dissimilatory APS reductase for the sulfate-reduction and sulfur-oxidation prokaryotes) functional genes were carried out. The results of the functional gene analysis suggested that members of Thaumarchaeota and alpha-proteobacteria were the potential players which participated in nitrogen and sulfur cycles in this marine carbonate sedimentary environment. This paper first described the microbial communities and their potential metabolic ways within the semi-consolidated carbonate sediments at the SWIR.
Keywords:marine chemistry; carbonate sediments; ferromanganese oxides; biodiversity; metabolic process
 
 
 

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