The effect of triclosan on microbial community structure in three soils

Chemosphere
E ButlerR van Egmond

Abstract

The application of sewage sludge to land can expose soils to a range of associated chemical toxicants. In this paper we explore the effects of the broad spectrum anti-microbial compound triclosan on the phenotypic composition of the microbial communities of three soils of contrasting texture (loamy sand, sandy loam and clay) using phospholipid fatty-acid (PLFA) analysis. Each soil type was dosed and subsequently re-dosed 6 weeks later with triclosan at five nominal concentrations in microcosms (10, 100, 500, 1000 mg kg(-1) and a zero-dose control). PLFA profiles were analysed using multivariate statistics focussing on changes in the soil phenotypic community structure. Additionally, ratios of fungal:bacterial PLFA indicators and cyclo:mono-unsaturated PLFAs (a common stress indicator) were calculated. It was hypothesised that triclosan addition would alter the community structure in each soil with a particular effect on the fungal:bacterial ratio, since bacteria are likely to be more susceptible to triclosan than fungi. It was also hypothesised that the PLFA response to re-dosing would be suppressed due to acclimation. Although the microbial community structure changed over the course of the experiment, the response was complex...Continue Reading

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Citations

Mar 29, 2013·Chemosphere·Muhammad Saif Ur RehmanJong-In Han
Mar 17, 2015·Ecotoxicology and Environmental Safety·Xiaolong HuangJiantong Liu
Oct 5, 2016·Soil Biology & Biochemistry·F C FraserK Ritz
Apr 2, 2017·Environmental Science and Pollution Research International·Romina CantareroInés Ahumada
Jun 10, 2017·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Ana R GomesRuth Pereira
Sep 2, 2017·FEMS Microbiology Letters·Morkel ZaaymanJacqui Horswell
Sep 18, 2018·Chemosphere·Vienvilay Phandanouvong-LozanoAnthony G Hay

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