Impact of silver nanoparticles on benthic prokaryotes in heavy metal-contaminated estuarine sediments in a tropical environment

•Some microbial communities in estuarine systems may be resistant to Ag-NPs.•Ag-NPs stress can have an antimicrobial effect on key microorganisms.•Ag-NPs have the potential to shape estuarine sediment bacterial community structure. Little knowledge is available about the potential impact of commerci...

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Bibliographic Details
Published in:Marine pollution bulletin 2015-10, Vol.99 (1-2), p.104-111
Main Authors: Antizar-Ladislao, B., Bhattacharya, B.D., Ray Chaudhuri, S., Sarkar, S.K.
Format: Article
Language:English
Subjects:
Bacteria - drug effects
Environment
Estuaries
Geologic Sediments - microbiology
Hugli estuary
India
Marine
Metals, Heavy - toxicity
Methanospirillum - drug effects
Microbial Consortia - drug effects
Microbial Consortia - genetics
Microbial dynamics
Nanoparticles
Nanoparticles - toxicity
Polymorphism, Restriction Fragment Length
Prokaryotic Cells - drug effects
Rivers
Sediment
Silver - chemistry
Silver - toxicity
Sundarban
Tropical Climate
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - toxicity
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Summary:•Some microbial communities in estuarine systems may be resistant to Ag-NPs.•Ag-NPs stress can have an antimicrobial effect on key microorganisms.•Ag-NPs have the potential to shape estuarine sediment bacterial community structure. Little knowledge is available about the potential impact of commercial silver nanoparticles (Ag-NPs) on estuarine microbial communities. The Hugli river estuary, India, is susceptible to heavy metals pollution through boat traffic, and there is the potential for Ag-NP exposure via effluent discharged from ongoing municipal and industrial activities located in close proximity. This study investigated the effects of commercial Ag-NPs on native microbial communities in estuarine sediments collected from five stations, using terminal restriction fragment length polymorphism (T-RFLP) technique. An increase in the number of bacteria in consortium in sediments was observed following exposure to Ag-NPs. In general microbial communities may be resistant in estuarine systems to the antimicrobial effects of commercial Ag-NPs, but key microorganisms, such as Pelobacter propionicus, disappeared following exposure to Ag-NPs. In conclusion, the T-RFLP analysis indicated that Ag-NPs have the potential to shape estuarine sediment bacterial community structure.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2015.07.051