Flow conditions influence diuron toxicokinetics and toxicodynamics in freshwater biofilms

Chaumet, Betty; Morin, Soizic; Hourtané, Océane; Artigas, Joan; Delest, Brigitte; Éon, Mélissa; Mazzella, Nicolás

doi:10.1016/j.scitotenv.2018.10.265

Cited by 42 publications

(41 citation statements)

References 42 publications

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“…All exposure conditions were prepared to ensure that the final concentration of acetonitrile reached 0.25%, which is below the established NOEC. For each condition, three nominal concentrations of diuron were selected: 0, 5 and 50 µg.L -1 (respectively named Ctrl, 5D and 50D, prepared from stock solution in ultrapure water), and the biofilms were exposed to these conditions during one and three days, to ensure that the equilibrium between diuron concentrations in water and in biofilms was reached (Chaumet et al, 2019). Moreover, the 3-day exposure was expected to be enough to highlight likely effects of photoperiod (16/8 photoperiod condition has 37 % more hours of illumination than 10/14 photoperiod condition).…”

Section: Experimental Designmentioning

confidence: 99%

“…Diuron and its main metabolites (DCPMU and DCPU) in biofilms and water samples were quantified by UPLC-ToF (Ultra-Performance Liquid Chromatography -Time of Flight Mass Spectrometry, Xevo G2-S ToF, Waters) as proceeded in a previous study (see Chaumet et al, 2019). An ACQUITY BEH C18 column 50 × 2.1 mm, 1.7 μm (Waters) was used for chromatographic separation at 45°C with a binary gradient of ultrapure water (at pH= 5) and methanol (both solutions with ammonium acetate to a concentration of 10 mM, CAS: 631-61-8, ULC quality Biosolve), and 20 µL of samples were injected.…”

Section: Diuron Quantification In Water and Biofilmmentioning

confidence: 99%

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Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

et al. 2020

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Variations of temperature and photoperiod throughout different seasons can affect aquatic communities such as biofilms. Biofilms, generally present at the base of trophic chains in freshwaters, are also subject to organic contamination, and are especially affected by herbicides.Many studies have investigated the effect and interactions of herbicides and environmental factors on biofilms, but never with a toxicokinetic point of view.The objective of this study was to assess structural and functional changes in biofilms exposed to diuron, and to link them with contaminant accumulation, under the influence of temperature and light variations. To this aim, biofilms were exposed to all possible combinations of three concentrations (0, 5 and 50 µg.L -1 ) of diuron, two temperatures (10 and 26°C), and two light/dark photoperiods (16/8, 10/14), for durations of 0, 1 and 3 days. Diuron accumulation in biofilms was quantified and structural descriptors (protein and polysaccharide contents, dry weight) and functional endpoints (photosynthetic and enzymatic activities) were analysed.The results obtained mainly highlighted the influence of temperature on diuron bioaccumulation and the associated toxic impact on biofilms. Bioaccumulation in biofilms exposed during three days at 10°C, at the highest diuron concentration, was in average 1.4 times higher than bioaccumulation on biofilms exposed to 26°C. Accordingly, the photosynthetic yield was more inhibited at lower than at higher temperatures. Temperature was also the highest impacting factor for metabolism regulation;for example, at 26°C after three days of exposure, polysaccharide production was boosted under both photoperiods tested.

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Section: Experimental Designmentioning

confidence: 99%

Section: Diuron Quantification In Water and Biofilmmentioning

confidence: 99%

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

et al. 2020

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“…The cysteine-rich domain of these proteins contains sulfhydryl groups and would act as trace metal chelating agents on the cell surface (Santos et al, 2013). The protective role of EPS has been also recently disputed under experimental conditions by Chaumet et al (2019), who tested toxicokinetic and toxicodynamic modelling of diuron under different flow conditions. However, evidence suggests that the thick and complicated 3D structure of mature biofilms forms a protective layer which limits the exposure of the inner zones to the external stressors and decreases toxicity of contaminants (Ivorra et al, 2000;Gold et al, 2003a, b).…”

Section: Trace Metalsmentioning

confidence: 99%

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

et al. 2021

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Over the last years, issues concerning diatom teratological forms and environmental stress have received growing interest within the scientific community. Publications on this topic dated back to 1890 and were summarized in a review published in 2009 by the journal Hydrobiologia, accounting for high citation rates (i.e. 117 citations Scopus and 232 citations Google Scholar, October 2020). This wide interest stimulates the authors to further unravel teratological forms significance in the light of the most recent publications (2010–2020). Diatom teratological forms are one of the best individual-level biomarkers since they provide a rapid response to several environmental stressors, including new emerging pollutants. The mechanisms involved in teratological valve likely involve both cytoskeleton and silicon metabolic pathway impairments. However, teratologies do not seem to weaken the reproduction capacity and viability of the affected individuals. We recognized eight types of teratologies as involving different parts of the valve, depending on genus. In order to summarize the information obtained by several years of research, we suggest a four-step procedure aimed at providing a theoretical pathway that researchers should follow to better explain results obtained in next-future studies and representing a starting point for the development of an environmental index based on teratological forms.

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“…This study showed that an insecticide such as fipronil may pose hazards to freshwater primary producers and decomposers. It has been demonstrated that herbicides (Paule et al, 2016;Chaumet et al, 2019;Dorigo et al, 2010) and their mixtures (Ham et al, 2014;Morin et al, 2012;Pesce et al, 2011) affect the microbial and photosynthetic fractions of the periphyton. However, as far as we know there is no information on the ecotoxicity effect of insecticides on biofilms.…”

Section: Effect Of Fipronil On Periphytonmentioning

confidence: 99%

Effects of the insecticide fipronil in freshwater model organisms and microbial and periphyton communities

Pino-Otín

Ballestero

Navarro³

et al. 2021

Science of The Total Environment

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Flow conditions influence diuron toxicokinetics and toxicodynamics in freshwater biofilms

Cited by 42 publications

References 42 publications

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

Effects of the insecticide fipronil in freshwater model organisms and microbial and periphyton communities

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