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Estuarine sediment hydrocarbon-degrading microbial communities demonstrate resilience to nanosilver

Beddow, Jessica and Stölpe, Björn and Cole, Paula A and Lead, Jamie R and Sapp, Melanie and Lyons, Brett P and McKew, Boyd and Steinke, Michael and Benyahia, Farid and Colbeck, Ian and Whitby, Corinne (2014) 'Estuarine sediment hydrocarbon-degrading microbial communities demonstrate resilience to nanosilver.' International Biodeterioration and Biodegradation, 96. pp. 206-215. ISSN 0964-8305

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Little is currently known about the potential impact of silver nanoparticles (AgNPs) on estuarine microbial communities. The Colne estuary, UK, is susceptible to oil pollution through boat traffic, and there is the potential for AgNP exposure via effluent discharged from a sewage treatment works located in close proximity. This study examined the effects of uncapped AgNPs (uAgNPs), capped AgNPs (cAgNPs) and dissolved Ag2SO4, on hydrocarbon-degrading microbial communities in estuarine sediments. The uAgNPs, cAgNPs and Ag2SO4 (up to 50 mg L−1) had no significant impact on hydrocarbon biodegradation (80–92% hydrocarbons were biodegraded by day 7 in all samples). Although total and active cell counts in oil-amended sediments were unaffected by silver exposure; total cell counts in non-oiled sediments decreased from 1.66 to 0.84 × 107 g−1 dry weight sediment (dws) with 50 mg L−1 cAgNPs and from 1.66 to 0.66 × 107 g−1 dws with 0.5 mg L−1 Ag2SO4 by day 14. All silver-exposed sediments also underwent significant shifts in bacterial community structure, and one DGGE band corresponding to a member of Bacteroidetes was more prominent in non-oiled microcosms exposed to 50 mg L−1 Ag2SO4 compared to non-silver controls. In conclusion, AgNPs do not appear to affect microbial hydrocarbon-degradation but do impact on bacterial community diversity, which may have potential implications for other important microbial-mediated processes in estuaries.

Item Type: Article
Uncontrolled Keywords: Silver nanoparticles; Hydrocarbon biodegradation; Estuarine sediments
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 13 Nov 2014 12:40
Last Modified: 21 Feb 2022 17:06

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