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Estuarine sediment hydrocarbon-degrading microbial communities demonstrate resilience to nanosilver

Beddow, J and Stölpe, B and Cole, PA and Lead, JR and Sapp, M and Lyons, BP and McKew, B and Steinke, M and Benyahia, F and Colbeck, I and Whitby, C (2014) 'Estuarine sediment hydrocarbon-degrading microbial communities demonstrate resilience to nanosilver.' International Biodeterioration and Biodegradation, 96. 206 - 215. ISSN 0964-8305

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Abstract

© 2014 The Authors. 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 50mgL-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 0.84×107g-1dry weight sediment (dws) with 50mgL-1cAgNPs and from 1.66 to 0.66×107g-1dws with 0.5mgL-1Ag2SO4by 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 50mgL-1Ag2SO4compared 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
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 13 Nov 2014 12:40
Last Modified: 26 Jun 2018 18:15
URI: http://repository.essex.ac.uk/id/eprint/11577

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