Effects of silver nanoparticles on bacterioplankton in a boreal lake

Blakelock, Graham C.; Xenopoulos, Marguerite A.; Norman, Beth C.; Vincent, John P.; Frost, Paul C.

doi:10.1111/fwb.12788

Cited by 12 publications

(17 citation statements)

References 47 publications

(80 reference statements)

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“…Blakelock et al . () investigated the effects of silver nanoparticles (AgNP) on bacterioplankton in large enclosures of a boreal lake. One of the main outcomes of this study is that no toxic effects of AgNP on bacterioplankton were observed.…”

Section: Overview Of Contributionsmentioning

confidence: 99%

“…() and Blakelock et al . () underline the importance of considering environmental context and the specific properties of particles, and especially the biological complexity within ecosystems, to assess toxicity of ENPs.…”

Section: Overview Of Contributionsmentioning

confidence: 99%

“…Another interesting finding of this work is that combined exposure to both stressors mitigated the adverse effects of the small and medium-sized nanoCuO. Blakelock et al (2016) investigated the effects of silver nanoparticles (AgNP) on bacterioplankton in large enclosures of a boreal lake. One of the main outcomes of this study is that no toxic effects of AgNP on bacterioplankton were observed.…”

Section: Emerging Contaminantsmentioning

confidence: 99%

“…temperature, pH, ionic strength, dissolved organic matter) that affect the stability of the ENPs and therefore their toxicity. Thus, the studies by Pradhan et al (2016) and Blakelock et al (2016) underline the importance of considering environmental context and the specific properties of particles, and especially the biological complexity within ecosystems, to assess toxicity of ENPs.…”

Section: Emerging Contaminantsmentioning

confidence: 99%

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Fostering integration of freshwater ecology with ecotoxicology

Gessner

Tlili

2016

Freshw Biol

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SUMMARY1. Ecology and ecotoxicology have different historical roots, despite their similar names, but are slowly converging to meet the challenge of addressing the massive global proliferation and release of chemicals in the environment. The conceptual, methodological, review and standard research papers in this special issue reflect this emerging trend of blending ecological and ecotoxicological perspectives to assess impacts in freshwater ecosystems. 2. Assessing community and ecosystem impacts of chemical contaminants is complex, however, and will require approaches that explicitly consider biological and chemical diversity as well as the natural variability of environmental factors at multiple spatial and temporal scales. 3. Central themes of the papers in this issue are (i) the importance of indirect effects of chemical contaminants on species interactions and food webs; (ii) effects of multiple stressors, especially interactions between contaminants and environmental factors; (iii) consequences of chemical exposure on ecosystem processes such as primary production and litter decomposition; (iv) the need to account for context dependency and (v) potentially harmful community and ecosystem effects of emerging contaminants, among which nanoparticles are prominently represented. 4. Collectively, these papers show that integrating ecological principles into the design and implementation of ecotoxicological research is essential for assessing and predicting contaminant impacts on biological communities and ecosystems. Conversely, applied ecology and bioassessment would benefit from concepts and approaches developed in ecotoxicology and from fully embracing chemical contaminants as key drivers of community structure and ecosystem processes.

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Section: Overview Of Contributionsmentioning

confidence: 99%

Section: Overview Of Contributionsmentioning

confidence: 99%

Section: Emerging Contaminantsmentioning

confidence: 99%

Section: Emerging Contaminantsmentioning

confidence: 99%

See 2 more Smart Citations

Fostering integration of freshwater ecology with ecotoxicology

Gessner

Tlili

2016

Freshw Biol

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“…Our primary goals were to compare the temporal patterns of the response of a boreal lake grazingbased food web (microbes, phytoplankton, and zooplankton) to trophic Ag accumulation following chronic or pulse AgNP exposure and to assess the corresponding response of plankton-driven ecosystem metabolism over time scales capturing plankton food web dynamics. These goals were part of a larger experiment investigating the response of plankton biomass, diversity, and production to AgNP exposure and the behaviour of AgNPs in natural waters, the results of which are published elsewhere (Furtado et al 2014(Furtado et al , 2015Blakelock et al 2016;Vincent et al 2017). We predicted that (i) Ag accumulation would predict biotic responses and (ii) ecosystem function would reflect these responses and be maintained or recover quickly when exposed to chronic AgNP addition but be impaired after exposure to a pulse of AgNPs.…”

Section: Introductionmentioning

confidence: 99%

Muted responses to Ag accumulation by plankton to chronic and pulse exposure to silver nanoparticles in a boreal lake

Norman

Frost

Blakelock

et al. 2019

FACETS

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Silver nanoparticles (AgNPs) are an emerging class of contaminants with the potential to impact ecosystem structure and function. AgNPs are antimicrobial, suggesting that microbe-driven ecosystem functions may be particularly vulnerable to AgNP exposure. Predicting the environmental impacts of AgNPs requires in situ investigation of environmentally relevant dosing regimens over time scales that allow for ecosystem-level responses. We used 3000 L enclosures installed in a boreal lake to expose plankton communities to chronic and pulse AgNP dosing regimens with concentrations mimicking those recorded in natural waters. We compared temporal patterns of plankton responses, Ag accumulation, and ecosystem metabolism (i.e., daily ecosystem respiration, gross primary production, and net ecosystem production) for 6 weeks of chronic dosing and 3 weeks following a pulsed dose. Ag accumulated in microplankton and zooplankton, but carbon-specific Ag was nonlinear over time and generally did not predict plankton response. Ecosystem metabolism did not respond to either AgNP exposure type. This lack of response corresponded with weak microplankton responses in the chronic treatments but did not reflect the stronger microplankton response in the pulse treatment. Our results suggest that lake ecosystem metabolism is somewhat resistant to environmentally relevant concentrations of AgNPs and that organismal responses do not necessarily predict ecosystem-level responses.

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Chronic and pulse exposure effects of silver nanoparticles on natural lake phytoplankton and zooplankton

et al. 2017

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The increasing use of silver nanoparticles (AgNPs) in consumer products raises concerns regarding the environmental exposure and impact of AgNPs on natural aquatic environments. Here, we investigated the effects of environmentally relevant AgNP concentrations on the natural plankton communities using in situ enclosures. Using twelve lake enclosures, we tested the hypotheses that AgNP concentration, dosing regimen, and capping agent (poly-vinyl pyrrolidone (PVP) vs. citrate) exhibit differential effects on plankton communities. Each of the following six treatments was replicated twice: control (no AgNPs added), low, medium, and high chronic PVP treatments (PVP-capped AgNPs added continuously, with target nominal concentrations of 4, 16, and 64 μg/L, respectively), citrate treatment (citrate-capped AgNPs added continuously, target nominal concentrations of 64 μg/L), and pulse treatment (64 μg/L PVP-AgNPs added as a single dose). Although Ag accumulated in the phytoplankton, no statistically significant treatment effect was found on phytoplankton community structure or biomass. In contrast, as AgNP exposure rate increased, zooplankton abundance generally increased while biomass and species richness declined. We also observed a shift in the size structure of zooplankton communities in the chronic AgNP treatments. In the pulse treatments, zooplankton abundance and biomass were reduced suggesting short periods of high AgNP concentrations affect zooplankton communities differently than chronic exposures. We found no evidence that capping agent affected AgNP toxicity on either community. Overall, our study demonstrates variable AgNP toxicity between trophic levels with stronger AgNP effects on zooplankton. Such effects on zooplankton are troubling and indicate that AgNP contamination could affect aquatic food webs.

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Effects of silver nanoparticles on bacterioplankton in a boreal lake

Cited by 12 publications

References 47 publications

Fostering integration of freshwater ecology with ecotoxicology

Fostering integration of freshwater ecology with ecotoxicology

Muted responses to Ag accumulation by plankton to chronic and pulse exposure to silver nanoparticles in a boreal lake

Chronic and pulse exposure effects of silver nanoparticles on natural lake phytoplankton and zooplankton

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