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    Seasonal variation in bacterial community composition and Seasonal variation in bacterial community composition and β-glucosidase expression in a tropical monsoon-influenced estuary

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    Aquat_Micr_Ecol_80_273.pdf (2.948Mb)
    Date
    2017
    Author
    Eswaran, R.
    Khandeparker, L.
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    Abstract
    Tidal 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.
    URI
    https://doi.org/10.3354/ame01855
    http://drs.nio.org/drs/handle/2264/7749
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