Universität zu Köln

Beddow, Jessica, Stolpe, Bjoern, Cole, Paula A., Lead, Jamie R., Sapp, Melanie ORCID: 0000-0002-0817-5425, Lyons, Brett P., Colbeck, Ian ORCID: 0000-0001-5668-1309 and Whitby, Corinne (2017). Nanosilver inhibits nitrification and reduces ammonia-oxidising bacterial but not archaeal amoA gene abundance in estuarine sediments. Environ. Microbiol., 19 (2). S. 500 - 511. HOBOKEN: WILEY. ISSN 1462-2920

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Abstract

Silver nanoparticles (AgNPs) enter estuaries via wastewater treatment effluents, where they can inhibit microorganisms, because of their antimicrobial properties. Ammonia-oxidising bacteria (AOB) and archaea (AOA) are involved in the first step of nitrification and are important to ecosystem function, especially where effluent discharge results in high nitrogen inputs. Here, we investigated the effect of a pulse addition of AgNPs on AOB and AOA ammonia monooxygenase (amoA) gene abundances and benthic nitrification potential rates (NPR) in low-salinity and mesohaline estuarine sediments. Whilst exposure to 0.5 mg L-1 AgNPs had no significant effect on amoA gene abundances or NPR, 50 mg L-1 AgNPs significantly decreased AOB amoA gene abundance (up to 76% over 14 days), and significantly decreased NPR by 20-fold in low-salinity sediments and by twofold in mesohaline sediments, after one day. AgNP behaviour differed between sites, whereby greater aggregation occurred in mesohaline waters (possibly due to higher salinity), which may have reduced toxicity. In conclusion, AgNPs have the potential to reduce ammonia oxidation in estuarine sediments, particularly where AgNPs accumulate over time and reach high concentrations. This could lead to long-term risks to nitrification, especially in polyhaline estuaries where ammonia-oxidation is largely driven by AOB.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Beddow, Jessica UNSPECIFIED UNSPECIFIED UNSPECIFIED Stolpe, Bjoern UNSPECIFIED UNSPECIFIED UNSPECIFIED Cole, Paula A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lead, Jamie R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sapp, Melanie UNSPECIFIED orcid.org/0000-0002-0817-5425 UNSPECIFIED Lyons, Brett P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Colbeck, Ian UNSPECIFIED orcid.org/0000-0001-5668-1309 UNSPECIFIED Whitby, Corinne UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-241637
DOI:	10.1111/1462-2920.13441
Journal or Publication Title:	Environ. Microbiol.
Volume:	19
Number:	2
Page Range:	S. 500 - 511
Date:	2017
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1462-2920
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COATED SILVER NANOPARTICLES; ION RELEASE KINETICS; RIVER COLNE ESTUARY; NITROSOMONAS-EUROPAEA; ESCHERICHIA-COLI; ANTIBACTERIAL ACTIVITY; NITRIFYING BACTERIA; COMMUNITY STRUCTURE; ACTIVATED-SLUDGE; UNITED-KINGDOM Multiple languages Microbiology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24163