Volume 78, Issue 3 pp. 565-585
Research Article

Microbial diversity in deep-sea sediment from the cobalt-rich crust deposit region in the Pacific Ocean

Li Liao

Li Liao

College of Life Sciences, Zhejiang University, Hangzhou, China

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Xue-Wei Xu

Xue-Wei Xu

Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou, China

The Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China

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Xia-Wei Jiang

Xia-Wei Jiang

College of Life Sciences, Zhejiang University, Hangzhou, China

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Chun-Sheng Wang

Chun-Sheng Wang

Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou, China

The Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China

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Dong-Sheng Zhang

Dong-Sheng Zhang

College of Life Sciences, Zhejiang University, Hangzhou, China

Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou, China

The Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China

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Jian-Yu Ni

Jian-Yu Ni

Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou, China

The Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China

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Min Wu

Corresponding Author

Min Wu

College of Life Sciences, Zhejiang University, Hangzhou, China

Correspondence: Min Wu, College of Life Sciences, Zhejiang University, Hangzhou 310058, China. Tel.: +86 571 88206595; fax: +86 571 88206048; e-mail: [email protected].Search for more papers by this author
First published: 24 August 2011
Citations: 7

Abstract

Cobalt-rich crusts are important metallic mineral resources with great economic potential, usually distributed on seamounts located in the Pacific Ocean. Microorganisms are believed to play a role in the formation of crusts as well as in metal cycling. To explore the microbial diversity related to cobalt-rich crusts, 16S ribosomal RNA gene clone libraries were constructed from three consecutive sediment layers. In total, 417 bacterial clones were obtained from three bacterial clone libraries, representing 17 distinct phylogenetic groups. Proteobacteria dominated in the bacterial communities, followed by Acidobacteria and Planctomycetes. Compared with high bacterial diversity, archaea showed a remarkably low diversity, with all 137 clones belonging to marine archaeal group I except one novel euryarchaeotal clone. The microbial communities were potentially involved in sulfur, nitrogen and metal cycling in the area of cobalt-rich crusts. Sulfur oxidation and metal oxidation were potentially major sources of energy for this ecosystem. This is the first reported investigation of microbial diversity in sediments associated with cobalt-rich crusts, and it casts fresh light on the microbial ecology of these important ecosystems.

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