Photocatalytic properties of titanium dioxide nanoparticles affect habitat selection of and food quality for a key species in the leaf litter decomposition process

Feckler, Alexander; Rosenfeldt, Ricki R.; Seitz, Frank; Schulz, Ralf; Bundschuh, Mirco

doi:10.1016/j.envpol.2014.09.022

Cited by 12 publications

(3 citation statements)

References 53 publications

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“…2b). UV-irradiation alone delayed emergence by eleven days; in combination with 4 and 400 µg nTiO 2 /L, this effect was significantly extended to 16 and 20 days, respectively, presumably due to the formation of reactive oxygen species 21 . Moreover, lipid concentrations of these adults were significantly decreased (Fig.…”

Section: Resultsmentioning

confidence: 96%

Nanoparticles transported from aquatic to terrestrial ecosystems via emerging aquatic insects compromise subsidy quality

Bundschuh

Englert

Rosenfeldt

et al. 2019

Sci Rep

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Nanoparticle contaminants enter aquatic ecosystems and are transported along the stream network. Here, we demonstrate a novel pathway for the return of nanoparticles from aquatic to terrestrial ecosystems via cross-boundary subsidies. During their emergence, trichopteran caddisflies carried titanium dioxide and gold nanoparticles into their terrestrial life stages. Moreover, their emergence was delayed by ≤30 days, and their energy reserves were depleted by ≤25%. Based on worst case estimates, it is suggested that terrestrial predators, such as bats feeding on aquatic prey, may ingest up to three orders of magnitude higher gold levels than anticipated for humans. Additionally, terrestrial predator species may suffer from alterations in the temporal availability and nutritional quality of their prey. Considering the substantial transfer of insect biomass to terrestrial ecosystems, nanoparticles may decouple aquatic and terrestrial food webs with important (meta-)ecosystem level consequences.

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Section: Resultsmentioning

confidence: 96%

Nanoparticles transported from aquatic to terrestrial ecosystems via emerging aquatic insects compromise subsidy quality

Bundschuh

Englert

Rosenfeldt

et al. 2019

Sci Rep

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“…Moreover, the observations of this first set of food selection experiments contradict at a first glance Feckler et al (2015). Fig.…”

Section: Food Selection By Gammaridsmentioning

confidence: 69%

“…These authors suggested that gammarids avoid leaf litter preexposed to UV in combination with nTiO 2 for 24 h over those exposed to the same nTiO 2 concentration in absence of UV. In their study, Feckler et al (2015) intentionally avoided microbial conditioning and the UV intensity was one order of magnitude above the one assessed in the present study. Consequently, it is assumed that one of the mechanisms they suggested, namely the potential formation of harmful lignin degradation products (e.g.…”

Section: Food Selection By Gammaridsmentioning

confidence: 74%

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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Effects of Engineered Nanoparticles on Plant Litter Decomposition in Streams

Tlili

2021

The Ecology of Plant Litter Decomposition in Stream Ecosystems

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Photocatalytic properties of titanium dioxide nanoparticles affect habitat selection of and food quality for a key species in the leaf litter decomposition process

Cited by 12 publications

References 53 publications

Nanoparticles transported from aquatic to terrestrial ecosystems via emerging aquatic insects compromise subsidy quality

Nanoparticles transported from aquatic to terrestrial ecosystems via emerging aquatic insects compromise subsidy quality

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Effects of Engineered Nanoparticles on Plant Litter Decomposition in Streams

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