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dc.contributor.authorSheeba, V.A.
dc.contributor.authorAnas, A.
dc.contributor.authorJasmin, C.
dc.contributor.authorVincent, M.
dc.contributor.authorParameswaran, P.S.
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.citationWorld Journal of Microbiology and Biotechnology, vol.36(5); 2020; Article no: 65
dc.identifier.issn1573-0972
dc.identifier.otherhttps://doi.org/10.1007/s11274-020-02842-1
dc.identifier.urihttps://doi.org/10.1007/s11274-020-02842-1
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8507
dc.descriptionIF2019 - 2.477
dc.description.abstractEstuaries being the connecting link between terrestrial and marine environment, experience spatial variations in the hydrographic variables as well as concentrations of pollutants. The present study reports a contrasting difference in the metal tolerance and enzyme activity of particle-associated bacteria (PAB) isolated from the upstream and downstream reaches of a tropical estuary [Cochin Estuary (CE) in the southwest coast of India], exposed to different levels of heavy metal contamination. The upstream of the estuary has been overloaded with heavy metals in the last few decades, while the downstream is less polluted. There were only 25% of culturable PAB phylogenetically common in both upstream and downstream. The PAB isolated from the upstream were dominated by gamma-proteobacteria (48.1%) followed by alpha-proteobacteria (25.0%), while it was in the reverse order of alpha-proteobacteria (45.9%) and gamma-proteobacteria (36.1%) in the downstream. More number of PAB from the upstream showed tolerance to higher concentrations of Zn and Cd. The Acinetobacter sp. MMRF1051 isolated from the upstream showed tolerance up to 250 mM Zn, 100 mM Cd, and 250 mM Ni. The enzyme expression profile of PAB from downstream was in the order of lipase > phosphatase > Beta-glucosidase > aminopeptidase, while it was in the order of Beta-glucosidase > lipase > aminopeptidase > phosphatase in the upstream of the estuary. The present study shows the selective pressure exerted by heavy metal pollution on the diversity of culturable bacteria associated with particulate matter in a tropical estuary. Also, the variation in their enzyme activities may impinge the remineralization of particulate organic matter (POM) in the system and may impart adverse impacts on ecosystem functioning.
dc.languageen
dc.publisherSpringer
dc.relation.ispartofWorld J Microbiol Biotechnol
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.titleResponse of particle-associated bacteria to long-term heavy metal contamination in a tropical estuary
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Kochi, Kerala, India


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