Chronic impacts of TiO 2 nanoparticles on Populus nigra L. leaf decomposition in freshwater ecosystem

Du, Jingjing; Zhang, Yuyan; Guo, Wei; Li, Ningyun; Gao, Chaoshuai; Cui, Minghui; Lin, Zhongdian; Wei, Mingbao; Zhang, Hongzhong

doi:10.1016/j.jhazmat.2018.02.010

Cited by 22 publications

(9 citation statements)

References 32 publications

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“…85 nm) likely contributes to the discrepancy between studies. Two additional studies targeted the impact of nTiO 2 on leaf decomposition in freshwater systems: the microbial decomposition of Populus nigra and Ficus vasta was reduced by up to 30%, which could be linked to changes in the leaf-associated microbial community, respiration, and enzymatic activity (Al Riyami et al 2019;Du et al 2018). In contrast to the present study, the concentrations used by these authors were up to two orders of magnitude (up to 500 mg/L) above those applied here.…”

Section: Microbial Leaf Litter Decompositionmentioning

confidence: 53%

“…Moreover, heterotrophic biofilms, which are often associated with detritus, exhibit an altered enzymatic activity (Schug et al 2014) under a combined exposure to nTiO 2 and UV, which points towards effects on ecosystem-level processes such as leaf litter decomposition. While the impact of nTiO 2 alone on leaf litter decomposition is documented elsewhere (Du et al 2018;Jain et al 2019), only one study assessed the combined effect of nTiO 2 and natural sunlight with unknown UV intensity. In this study, Al Riyami et al (2019) observed that sunlight mitigates the impact of nTiO 2 observed in darkness on microbial leaf mass loss, which the authors related to the release of ROS degrading structural polysaccharides in the leaves.…”

Section: Introductionmentioning

confidence: 99%

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Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Bundschuh

Zubrod

Konschak

et al. 2021

Environ Sci Pollut Res

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Nanoparticulate titanium dioxide (nTiO2) is frequently applied, raising concerns about potential side effects on the environment. While various studies have assessed structural effects in aquatic model ecosystems, its impact on ecosystem functions provided by microbial communities (biofilms) is not well understood. This is all the more the case when considering additional stressors, such as UV irradiation — a factor known to amplify nTiO2-induced toxicity. Using pairwise comparisons, we assessed the impact of UV (UV-A = 1.6 W/m2; UV-B = 0.7 W/m2) at 0, 20 or 2000 μg nTiO2/L on two ecosystem functions provided by leaf-associated biofilms: while leaf litter conditioning, important for detritivorous invertebrate nutrition, seems unaffected, microbial leaf decomposition was stimulated (up to 25%) by UV, with effect sizes being higher in the presence of nTiO2. Although stoichiometric and microbial analyses did not allow for uncovering the underlying mechanism, it seems plausible that the combination of a shift in biofilm community composition and activity together with photodegradation as well as the formation of reactive oxygen species triggered changes in leaf litter decomposition. The present study implies that the multiple functions a microbial community performs are not equally sensitive. Consequently, relying on one of the many functions realized by the same microbial community may be misleading for environmental management.

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Section: Microbial Leaf Litter Decompositionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Bundschuh

Zubrod

Konschak

et al. 2021

Environ Sci Pollut Res

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“…Increasing evidence suggests that many such contaminants can have adverse effects on OM-associated microbial communities, with consequences for OM decomposition rates (e.g. Flores et al 2014;Zubrod et al 2011;Tlili et al 2016;Du et al 2018). Additionally, indirect effects on detritivorous food webs are possible.…”

Section: Introductionmentioning

confidence: 99%

“…However, while NPs were observed to negatively affect growth and diversity of OM-associated microbial communities (e.g. Tlili et al 2016;Du et al 2018;Pradhan et al 2012;Batista et al 2017a, b), bottom-up directed effects on detritivore growth remain unclear.…”

Section: Introductionmentioning

confidence: 99%

“…Many NPs have anti-microbial properties and the tendency to adsorb onto OM, and thus it can be hypothesized that NPs indirectly affect invertebrate growth by negatively affecting the OM-associated microbial communities (Holsapple et al 2005;Pradhan et al 2016;Fabrega et al 2009;Du et al 2018) or through the uptake of NPs as part of their food. We therefore assessed the effects of sub-lethal and environmentally relevant concentrations of silver nanoparticles (AgNPs) as a model emerging toxicant on (1) the activity and metabolic diversity of OM-associated microorganisms, and (2) the growth of the detritivore Asellus aquaticus in a well-controlled laboratory setting.…”

Section: Introductionmentioning

confidence: 99%

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Microbially-mediated indirect effects of silver nanoparticles on aquatic invertebrates

et al. 2018

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Complex natural systems are affected by multiple anthropogenic stressors, and therefore indirect effects within food webs are increasingly investigated. In this context, dead organic matter (OM) or detritus provides a food source sustaining detrital food webs that recycle the retained energy through microbial decomposition and invertebrate consumption. In aquatic environments, poorly water-soluble contaminants, including nanoparticles (NPs), quickly adsorb onto OM potentially modifying OM-associated microbial communities. Since invertebrates often depend on microbial conditioning to enhance OM quality, adverse effects on OM-associated microbial communities could potentially affect invertebrate performances. Therefore, this study assessed the effect of environmentally relevant concentrations of the model emerging contaminant, silver nanoparticles (AgNPs), on OM-associated microorganisms and subsequent indirect effects on growth of the invertebrate Asellus aquaticus. At low concentrations (0.8 ug/L), AgNPs inhibited activity and altered metabolic diversity of the OM-associated microbial community. This was observed to coincide with a negative effect on the growth of A. aquaticus due to antimicrobial properties, as a decreased growth was observed when offered AgNP-contaminated OM. When A. aquaticus were offered sterile OM in the absence of AgNPs, invertebrate growth was observed to be strongly retarded, illustrating the importance of microorganisms in the diet of this aquatic invertebrate. This outcome thus hints that environmentally relevant concentrations of AgNPs can indirectly affect the growth of aquatic invertebrates by affecting OM-associated microbial communities, and hence that microorganisms are an essential link in understanding bottom-up directed effects of chemical stressors in food webs.

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Effects of pollution on freshwater aquatic organisms

Amoatey

Baawain

2019

Water Environment Research

167

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This paper presents the reviews of scientific papers published in 2018 issues on the effects of anthropogenic pollution on the aquatic organisms dwelling in freshwater ecosystem at global scale. The first part of the study provides the summary of relevant literature reviews followed by field and survey based studies. The second part is based on categories of different classes/sources of pollutants which affect freshwater organism. This is composed of several sections including metals and metalloids, wastewater and effluents, sediments, nutrients, pharmaceuticals, polycyclic aromatic hydrocarbons, flame retardants, persistent organic pollutants, pharmaceuticals and illicit drugs, emerging contaminants, pesticides, herbicides, and endocrine disruptors. The final part of the study highlights the reviews of published research work on new pollutants such as microplastics and engineered nanoparticles which affect the freshwater organisms.Practitioner points Heavy metals concentrations should be assessed at nano‐scale in aquatic environment. Air pollutants could have long‐term effects on freshwater ecosystem. Future studies should focus on bioremediations of freshwater pollution.

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Chronic impacts of TiO 2 nanoparticles on Populus nigra L. leaf decomposition in freshwater ecosystem

Cited by 22 publications

References 32 publications

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Microbially-mediated indirect effects of silver nanoparticles on aquatic invertebrates

Effects of pollution on freshwater aquatic organisms

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