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

DRS at CSIR-National Institute of Oceanography

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Title 16S rRNA-based bacterial diversity in the organic-rich sediments underlying oxygen-deficient waters of the eastern Arabian Sea
 
Creator Divya, B.
Parvathi, A.
LokaBharathi, P.A.
Nair, S.
 
Subject species diversity
bacteria
sediments
oxygen minimum layer
 
Description 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.
 
Date 2011-12-08T10:08:23Z
2011-12-08T10:08:23Z
2011
 
Type Journal Article
 
Identifier World Journal of Microbiology and Biotechnology, vol.27; 2011; 2821-2833
no
http://drs.nio.org/drs/handle/2264/3975
 
Language en
 
Relation World_J_Microbiol_Biotechnol_27_2821.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2011] Springer.
 
Publisher Springer