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dc.contributor.authorEswaran, R.
dc.contributor.authorKhandeparker, L.
dc.date.accessioned2020-12-31
dc.date.accessioned2021-02-09T10:13:19Z
dc.date.available2020-05-01
dc.date.available2021-02-09T10:13:19Z
dc.date.issued2020
dc.identifier.citationMarine Environmental Research, vol.159; 2020; Article no: 104997
dc.identifier.issn1879-0291
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0141113620300362
dc.identifier.urihttps://doi.org/10.1016/j.marenvres.2020.104997
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8504
dc.descriptionIF2019 - 2.727
dc.description.abstractThe influence of changing salinity on community composition and functional activity (Bacterial Production (BP) and ectoenzyme activity) of major bacterial taxa was evaluated using microcosm experiments in a tropical monsoon influenced estuary. Natural bacterial inocula at different salinities, representing marine, brackish, and freshwater, were inter-transferred and elucidated their response with an emphasis on community composition and Beta-Glucosidase (BGase) activity. The results revealed a significant decrease in the total bacterial count (TBC) and BP on the translocation of bacterial inocula to different salinity conditions in the case of freshwater bacteria. However, a significant increase in BGase activity coupled with shifts in the studied bacterial groups was evident in the case of marine as well as freshwater bacteria. Quantitative PCR (qPCR) revealed a shift in major bacterial taxa upon translocation to different waters, which was dependent on salinity and the source of inocula. Redundancy and qPCR analyses showed that members belonging to Gammaproteobacteria and Betaproteobacteria were higher, and possibly influenced BGase activity in marine and freshwater, respectively. Translocation of marine inocula to brackish and freshwater resulted in an emergence of Bacteroidetes, Actinobacteria, and Betaproteobacteria, respectively. Whereas, when freshwater inocula were translocated to marine or brackish water, Alphaproteobacteria and Gammaproteobacteria taxa emerged, and this was coupled with increased BGase activity. In contrast, brackish water bacteria showed a strong persistence in bacterial community composition when translocated to different salinities within this estuary. Such phylogenetic persistence or changes suggests species level shifts in specific bacterial taxa, and unravelling the same using different functional gene markers would ascertain their role in organic matter processing and is way forward.
dc.languageen
dc.publisherElsevier Ltd
dc.relation.ispartofMar Environ Res
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleInfluence of salinity stress on bacterial community composition and β-glucosidase activity in a tropical estuary: Elucidation through microcosm experiments
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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