Resilience and recovery: The effect of triclosan exposure timing during development, on the structure and function of river biofilm communities

Lawrence, John R.; Topp, Edward; Waiser, Marley J.; Tumber, Vijay; Roy, James W.; Swerhone, G. D. W.; Leavitt, Peter R.; Paule, Armelle; Korber, Darren R.

doi:10.1016/j.aquatox.2015.02.012

Cited by 29 publications

(30 citation statements)

References 58 publications

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“…However, we detected no effects on the growth of cultures relative to controls (data not presented). Similar observations were obtained previously for other chemicals, where significant effects of chlorhexidine, triclosan, and triclocarban were observed on the natural community with no detectable impacts on selected pure cultures (Lawrence et al , 2009, ). It has been suggested in a number of studies (Lawrence et al , ; Wilson et al ) that natural assemblages and communities provide greater insight into potential impacts than studies using selected pure cultures.…”

Section: Resultssupporting

confidence: 88%

“…Community-level testing can be a very useful tool in ecotoxicology because of its relatively high ecological realism and reliability when assessing the ecological effects of a contaminant or a mixture (Porsbring et al 2007). The studies of Lawrence et al (2004Lawrence et al ( , 2005Lawrence et al ( , 2007Lawrence et al ( , 2009Lawrence et al ( , 2015 and Chénier et al (2003Chénier et al ( , 2006 have demonstrated that the application of an array of traditional and molecular techniques can effectively determine the responses of complex microbial communities to a range of stresses. Changes in photosynthetic and bacterial biomass were also reflected in the amount of exopolymer detected using lectin binding analyses (Figure 2).…”

Section: Algae-cyanobacteria-bacteriamentioning

confidence: 99%

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N,N‐Diethyl‐m‐Toluamide Exposure at an Environmentally Relevant Concentration Influences River Microbial Community Development

Lawrence

Waiser

Swerhone

et al. 2019

Enviro Toxic and Chemistry

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Studies of the South Saskatchewan River confirmed that N,N‐diethyl‐m‐toluamide (DEET) is ubiquitous at 10 to 20 ng/L, whereas in effluent‐dominated Wascana Creek, levels of 100 to 450 ng/L were observed. Effects of DEET exposure were assessed in microbial communities using a wide variety of measures. Communities developed in rotating annular reactors with either 100 or 500 ng/L DEET, verified using gas chromatography‐mass spectrometry analyses. Microscale analyses indicated that both DEET concentrations resulted in significant (p < 0.05) declines in photosynthetic biomass, whereas bacterial biomass was unaffected. There was no detectable effect of DEET on the levels of chlorophyll a. However, pigment analyses indicated substantial shifts in algal–cyanobacterial community structure, with reductions of green algae and some cyanobacterial groups at 500 ng/L DEET. Protozoan/micrometazoan grazers increased in communities exposed to 500 ng/L, but not 100 ng/L, DEET. Based on thymidine incorporation or utilization of carbon sources, DEET had no significant effects on metabolic activities. Fluorescent lectin‐binding analyses showed significant (p < 0.05) changes in glycoconjugate composition at both DEET concentrations, consistent with altered community structure. Principal component cluster analyses of denaturing gradient gel electrophoresis indicated that DEET exposure at either concentration significantly changed the bacterial community (p < 0.05). Analyses based on 16S ribosomal RNA of community composition confirmed changes with DEET exposure, increasing detectable beta‐proteobacteria, whereas actinobacteria and acidimicrobia became undetectable. Further, cyanobacteria in the subclass Oscillatoriophycideae were similarly not detected. Thus, DEET can alter microbial community structure and function, supporting the need for further evaluation of its effects in aquatic habitats. Environ Toxicol Chem 2019;38:2414–2425. © 2019 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals, Inc. on behalf of SETAC

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Section: Resultssupporting

confidence: 88%

Section: Algae-cyanobacteria-bacteriamentioning

confidence: 99%

N,N‐Diethyl‐m‐Toluamide Exposure at an Environmentally Relevant Concentration Influences River Microbial Community Development

Lawrence

Waiser

Swerhone

et al. 2019

Enviro Toxic and Chemistry

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“…Narrowe et al (2015) demonstrated in fathead minnows that low nanomolar doses of TCS changed the fish microbiome which recovered after removal of TCS. However, Lawrence et al (2015) using rotating annular reactors to cultivate river biofilms found no recovery after removal of TCS. Recently, in zebrafish, Tal (2017) noted that TCS did not reduce the overall number of microbes but decreases the variety of microbial species.…”

Section: Introductionmentioning

confidence: 99%

Triclosan exposure, transformation, and human health effects

Weatherly

Gosse

2017

Journal of Toxicology and Environmental Health, Part B

428

236

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Triclosan (TCS) is an antimicrobial used so ubiquitously that 75% of the U.S.A. population is likely exposed to this compound via consumer goods and personal care products. In September 2016, TCS was banned from soap products following the risk assessment by the U.S.A. Food and Drug Administration (FDA). However, TCS still remains, at high concentrations, in other personal care products such as toothpaste, mouthwash, hand sanitizer, and surgical soaps. Triclosan is readily absorbed into human skin and oral mucosa and found in various human tissues and fluids. The aim of this review was to describe TCS exposure routes and levels as well as metabolism and transformation processes. The burgeoning literature on human health effects associated with TCS exposure, such as reproductive problems was also summarized.

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“…The potential influences of PPCPs on the diversity and function of freshwater microbial communities were also assessed by means of several laboratory-scale microcosm or mesocosm experiments (Yergeau et al, 2012;Lawrence et al, 2015;Sabater et al, 2016). It has been suggested that the pseudo-persistent PPCPs may have contrasting ecological effects on the aquatic community: PPCPs may become carbon and energy sources to certain members of the natural microbial community via biodegradation (subsidy effect), while being toxic to others (stress effect) -even though their environmental concentrations are generally low (ng/L-lg/L range) (Luo et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Strong impact of anthropogenic contamination on the co‐occurrence patterns of a riverine microbial community

Hou

et al. 2017

Environmental Microbiology

233

112

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Although the health of rivers is threatened by multiple anthropogenic stressors with increasing frequency, it remains an open question how riverine microbial communities respond to emerging micropollutants. Here, by using 16S rDNA amplicon sequencing of 60 water samples collected during different hydrological seasons, we investigated the spatio-temporal variation and the co-occurrence patterns of microbial communities in the anthropogenically impacted Jiulong River in China. The results indicated that the riverine microbial co-occurrence network had a nonrandom, modular structure, which was mainly shaped by the taxonomic relatedness of co-occurring species. Fecal indicator bacteria may survive for prolonged periods of time in river water, but they formed an independent module which had fewer interactions with typical freshwater bacteria. Multivariate analysis demonstrated that nutrients and micropollutants [i.e., pharmaceuticals and personal care products (PPCPs)] exerted combined effects in shaping α- and β-diversity of riverine microbial communities. Remarkably, we showed that a hitherto unrecognized disruptive effect of PPCPs on the abundance variations of central species and module communities was stronger than the influence of physicochemical factors, suggesting the key role played by micropollutants for the microbial co-occurrence relationships in lotic ecosystems. Overall, our findings provide novel insights into community assembly in aquatic environments experiencing anthropogenic stresses.

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Resilience and recovery: The effect of triclosan exposure timing during development, on the structure and function of river biofilm communities

Cited by 29 publications

References 58 publications

N,N‐Diethyl‐m‐Toluamide Exposure at an Environmentally Relevant Concentration Influences River Microbial Community Development

N,N‐Diethyl‐m‐Toluamide Exposure at an Environmentally Relevant Concentration Influences River Microbial Community Development

Triclosan exposure, transformation, and human health effects

Strong impact of anthropogenic contamination on the co‐occurrence patterns of a riverine microbial community

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