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dc.contributor.authorEswaran, R.
dc.contributor.authorKhandeparker, L.
dc.date.accessioned2018-06-06
dc.date.accessioned2018-10-23T09:24:50Z
dc.date.available2017-12-13
dc.date.available2018-10-23T09:24:50Z
dc.date.issued2017
dc.identifier.citationAquatic Microbial Ecology, vol.80(3); 2017; 273-287
dc.identifier.issn0948-3055
dc.identifier.urihttps://doi.org/10.3354/ame01855
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7749
dc.description.abstractTidal estuaries receive carbohydrate-rich organic matter from various sources, which are mainly broken down by enzymatic processes. ?-glucosidase (?-Glu) is one of the ectoenzymes produced by heterotrophic bacteria. An investigation was carried out along the tropical monsoon-influenced Zuari estuary to examine seasonal variability in major bacterial taxa, ?-Glu gene abundance, and number of cells expressing ?-Glu. The results revealed a higher number of ?-Glu expressing cells, and higher ?-Glu gene and bacterial abundance at the estuarine mouth compared to the upstream area, and this was coupled with high phytoplankton biomass and low transparent exopolysaccharides. A clear distinction in bacterial assemblages along with ?-Glu expression levels was evident during different seasons. Likewise, a spatial pattern in major bacterial taxa was observed along the salinity gradient, with high proportions of Alpha- and Gammaproteobacteria at the saline mouth and Betaproteobacteria at the upstream, freshwater region. During the southwest monsoon, which brings high freshwater influx, Actinobacteria and Firmicutes were abundant in the mid-estuarine region. Bacterial production at this time was mainly fueled by allochthonous riverine sources, with a significant decrease in the number of cells expressing the ?-Glu to gene ratio. ?-Glu gene abundance was related to diverse groups (Alpha- and Gammaproteobacteria, Actinobacteria, and Firmicutes). The number of cells expressing ?-Glu covaried with Gammaproteobacteria abundance and was influenced by suspended load, salinity, chlorophyll a and organic pool. Future studies should assess response of marine, brackish, and freshwater bacteria to different environmental conditions to ascertain their specific role in organic matter processing.
dc.language.isoen
dc.publisherInter Research
dc.relation.ispartofAquat Microb Ecol
dc.relation.isreferencedbySCI
dc.titleSeasonal variation in bacterial community composition and Seasonal variation in bacterial community composition and β-glucosidase expression in a tropical monsoon-influenced estuary
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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