16S rRNA-based bacterial diversity in the organic-rich sediments underlying oxygen-deficient waters of the eastern Arabian Sea

The eastern Arabian Sea has a unique and permanent oxygen minimum zone (OMZ) that extends along the western continental margin of India. The sediment below this region is rich in organic matter. This study describes the bacterial community structure and diversity in OMZ sediments of the eastern Arab...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2011-12, Vol.27 (12), p.2821-2833
Main Authors: Divya, Baby, Parvathi, Ammini, Loka Bharathi, P. A., Nair, Shanta
Format: Article
Language:English
Subjects:
Applied Microbiology
Arabian Sea
Bacteria
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Cloning
Communities
Community structure
Continental margins
Environmental Engineering/Biotechnology
Falling
Firmicutes
Fundamental and applied biological sciences. Psychology
Genetic diversity
Hypoxia
Laboratories
Libraries
Life Sciences
Microbiology
Oceanography
Oceans
Organic matter
Original Paper
Phylogenetics
Planctomycetes
Plasmids
Proteobacteria
Sediments
Statistics
Studies
Taxonomy
Verrucomicrobia
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Summary:The eastern Arabian Sea has a unique and permanent oxygen minimum zone (OMZ) that extends along the western continental margin of India. The sediment below this region is rich in organic matter. This study describes the bacterial community structure and diversity in OMZ sediments of the eastern Arabian Sea (AS) through 16S rRNA clone library analysis. Phylogenetic analysis of the sequences demonstrated that phylum Proteobacteria (52%), followed by Planctomycetes (12.7%), Chloroflexi and an unidentified bacterial group (8.8% each) were represented in the library. Deltaproteobacteria was the dominant class (62.5%) in phylum Proteobacteria with clones falling in orders Syntrophobacterales and Desulfovibrionales. Few minor phylogenetic groups, corresponding to Spirochetes, Firmicutes, Acidobacteria and Verrucomicrobia were found. Unidentified candidate groups falling in OP11, OP8 and OP3 were represented by 0.9, 2.9 and 3.9%, respectively and two clusters of the cloned sequences in this study showed very low identity to known sequences. This is the first report that discusses the phylogenetic groups in the OMZ sediments of eastern Arabian Sea individually and compares it with available data from marine hypoxic locales and water mass. LIBSHUFF statistics revealed high richness of the bacterial community of the Arabian Sea OMZ (AS-OMZ) compared to the other regions.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-011-0760-0