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Microbial communities in coastal subsurface sediments play an important role in biogeochemical cycles. In this study microbial communities in tidal subsurface sediments of Balramgari in the state of Orissa, India were investigated using a culture independent approach. Two 16S rDNA cloned libraries were prepared from the closely located (100 m along the coast) subsurface sediment samples. Library I sediment samples had higher organic carbon content but lower sand percentage in comparison to Library II. A total of 310 clone sequences were used for DOTUR analysis which revealed 51 unique phylotypes or operational taxonomic units (OTUs) for both libraries. The OTUs were affiliated with 13 major lineages of domain bacteria including Proteobacteria (α, β, δ and λ), Acidobacteria, Actinobacteria, Cyanobacteria, Chloroflexi, Firmicutes, Verrucomicrobia, Bacteroidetes, Gemmatimonadetes and TM7. We encountered few pathogenic bacteria such as Aeromonas hydrophila and Ochrobactrum intermedium, in sediment from Library I. ∫-LIBSHUFF comparison depicts that the two libraries were significantly different communities. Most of the OTUs from both libraries possessed ≥85% to &lt;97% similarity to RDP database sequences depicting the putative presence of new species, genera and phylum. This work revealed the complex and unique bacterial diversity from coastal habitat of Balramgari and shows that, in coastal habitat a variability of physical and chemical parameter has a prominent impact on the microbial community structure.

Phylogenetic profiling of bacterial community from two intimately located sites in Balramgari, North-East coast of India