Abstract
Coastal sand dunes (CSDs), unique, stressed and hostile habitats act as a barrier between marine and terrestrial ecosystems. CSDs are stressed in terms of nutrition and fluctuating physio-chemical conditions. CSD is classified into several types, each of which presents different challenges for life forms. This study focuses on exploring bacterial and archaeal diversity and community structure in four CSD namely, Embryo, Fore, Gray, and Mature dunes of Keri beach, Goa along the west coast of India. The study was carried out using Next Generation Sequencing of hypervariable V3–V4 regions of the 16S rRNA gene using Illumina HiSeq platform. The present study hypothesizes that the prokaryotic communities at each dune may be different and could have different role in the ecosystem. The NGS for Embryo, Fore, Gray, and Mature dunes gave 1,045,447, 1,451,753, 1,321,867, and 1,537,758 paired-end reads, respectively, out of which 54,500, 50,032, 37,819, and 111,186 were retained through various quality filtrations. A total of 74, 63, 65, and 65% of OTUs, respectively, remained unknown at the species level. The highest bacterial and archaeal abundance was reported from Mature and Embryo dunes, respectively. Phylum Actinobacteria dominated the Embryo, Fore, and Mature dunes, whereas phylum Proteobacteria was the dominant in the Gray dune. Streptomyces was predominant in overall CSD followed by Bacillus, Acidobacterium, and Kouleothrix. The commonly and exclusively found members in each dune are cataloged. The highest species dominance, diversity, species richness, and abundance were observed in Embryo, Fore, Gray, and Mature dunes, respectively. The present study clearly elucidates that each dune has a distinct microbial community structure.
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Acknowledgements
This work was supported by University Grant Commission (UGC), National Fellowship for Students to pursue a Ph.D. degree [award letter number: F./2014-15/NFO-2014-15-OBC-GOA-486/(SA-III/website)]. The authors would like to thank Dr. Priya Mallika D’Costa, faculty at Goa University for going through the manuscript and giving valuable suggestions.
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This work was supported by the University Grant Commission (UGC), National Fellowship for Students to pursue a Ph.D. degree [award letter number: F./2014-15/NFO-2014-15-OBC-GOA-486/(SA-III/website)].
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All authors contributed to the study conception and design. Materials preparation, data collection, and analysis were performed by SAS and SG. The draft of the manuscript was written by SAS and SG commented on previous versions of the manuscript. All the authors read and approved the final manuscript.
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Shet, S.A., Garg, S. Prokaryotic diversity of tropical coastal sand dunes ecosystem using metagenomics. 3 Biotech 11, 252 (2021). https://doi.org/10.1007/s13205-021-02809-5
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DOI: https://doi.org/10.1007/s13205-021-02809-5