Resistance and recovery of river biofilms receiving short pulses of Triclosan and Diuron

Proia, Lorenzo; Morin, Soizic; Peipoch, Marc; Romaní, Anna M.; Sabater, Sergi

doi:10.1016/j.scitotenv.2011.05.013

Cited by 90 publications

(83 citation statements)

References 53 publications

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“…Of prime speculation has been the potential for cascading ecological consequences for stream communities, given demonstrated biofilm-specific effects [22,27,29,31]. Our results equally demonstrated changes in the biofilm community, in terms of bacterial cell density, algal biomass, and algal structure (decreased cyanobacteria densities, potential change in diatom species).…”

Section: Discussionsupporting

confidence: 55%

Effects of a chronic lower range of triclosan exposure on a stream mesocosm community

Nietch¹,

Quinlan

Lazorchak³

et al. 2013

Enviro Toxic and Chemistry

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Triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol) is an antimicrobial found in consumer soaps and toothpaste. It is in treated wastewater effluents at low parts-per-billion concentrations, representing a potentially chronic exposure condition for biota inhabiting receiving streams. For the present study, a naturally colonized benthos was created using flow-through indoor mesocosms; then, the benthic communities were dosed to achieve different in-stream triclosan concentrations (control, 0.1 μg/L, 0.5 μg/L, 1.0 μg/L, 5.0 μg/L, and 10 μg/L) for 56 d. Water quality parameters and endpoints from bacteria to macroinvertebrates, as well as interacting abiotic components, were measured. Effects of triclosan on specific microbial endpoints were observed at all doses, including an effect on litter decomposition dynamics at doses of 1.0 μg/L and higher. Resistance of periphytic bacteria to triclosan significantly increased at doses of 0.5 μg/L and above. By the end of dosing, the antimicrobial appeared to stimulate the stream periphyton at the 3 lowest doses, while the 2 highest doses exhibited decreased stocks of periphyton, including significantly lower bacteria cell densities and cyanobacteria abundance compared with the control. Other than an effect on benthic ostracods, the changes that occurred in the periphyton did not translate to significant change in the colonizing nematodes, the macroinvertebrate community as a whole, or other measurements of stream function. The results shed light on the role a low, chronic exposure to triclosan may play in effluent-dominated streams.

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Section: Discussionsupporting

confidence: 55%

Effects of a chronic lower range of triclosan exposure on a stream mesocosm community

Nietch¹,

Quinlan

Lazorchak³

et al. 2013

Enviro Toxic and Chemistry

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“…Previous reports on TCS effects on aggregated phytoplankton community features are controversial. Pulse exposure (48 h duration) to TCS at 60 lg L -1 has shown to cause higher Chl-a content after 7 days and increased mortality of diatoms and bacteria in biofilms, consequently reducing biodiversity (Proia et al 2011). At lower doses (similar to those used in our study), TCS treatment has resulted in stimulation of pigment content at community level (hormetic effects) in one study (Backhaus et al 2011), and non-significant differences in biomass yields with marked shifts in the community structure (reduced species richness) at higher concentrations (Wilson et al 2003).…”

Section: Community Effects Of Tcsmentioning

confidence: 99%

Assessing triclosan-induced ecological and trans-generational effects in natural phytoplankton communities: a trait-based field method

Pomati

Nizzetto

2013

Ecotoxicology

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We exposed replicated phytoplankton communities confined in semi-permeable membrane-based mesocosms to 0, 0.1, 1 and 10 lg L -1 triclosan (TCS) and placed them back in their original environment to investigate the occurrence of trans-generational responses at individual, population and community levels. TCS diffused out of mesocosms with a half-life of less than 8 h, so that only the parental generation was directly stressed. At the beginning of the experiment and after 7 days (approximately 2 generations) we analysed responses in the phytoplankton using scanning flow-cytometry. We acquired information on several individually expressed phenotypic traits, such as size, biovolume, pigment fluorescence and packaging, for thousands of individuals per replicated population and derived population and community aggregated traits. We found significant changes in community functioning (increased productivity in terms of biovolume and total fluorescence), with maximal effects at 1 lg L -1 TCS. We detected significant and dose-dependent responses on population traits, such as changes in abundance for several populations, increased average size and fluorescence of cells, and strong changes in within-population trait mean and variance (suggesting micro-evolutionary effects). We applied the Price equation approach to partition community effects (changes in biovolume or fluorescence) in their physiological and ecological components, and quantified the residual component (including also evolutionary responses). Our results suggested that evolutionary or inheritable phenotypic plasticity responses may represent a significant component of the total observed change following exposure and over relatively small temporal scales.

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“…Community-level testing in ecotoxicology can be a useful tool due to its relatively high ecological realism and reliability (Porsbring et al, 2007;Sabater et al, 2007). Several studies have addressed triclosan's impacts on complex aquatic communities (Drury et al, 2013;Franz et al, 2008;Lawrence et al, 2009;Ricart et al, 2010;Proia et al, 2011;Nietch et al, 2013). Lawrence et al (2009) reported that TCS exposure at 10 g l −1 resulted in significant reductions in algal biomass, carbon utilization, changes in bacterial community composition and alteration of the community structure.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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Resistance and recovery of river biofilms receiving short pulses of Triclosan and Diuron

Cited by 90 publications

References 53 publications

Effects of a chronic lower range of triclosan exposure on a stream mesocosm community

Effects of a chronic lower range of triclosan exposure on a stream mesocosm community

Assessing triclosan-induced ecological and trans-generational effects in natural phytoplankton communities: a trait-based field method

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

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