Impact of manufactured TiO2 nanoparticles on planktonic and sessile bacterial communities

Abstract : In the present study, we conducted a 2 week microcosm experiment with a natural freshwater bacterial community to assess the effects of titanium dioxide nanoparticles (TiO2-NPs) at various concentrations (0, 1, 10 and 100 mg/L) on planktonic and sessile bacteria under dark conditions. Results showed an increase of planktonic bacterial abundance at the highest TiO2-NP concentration, concomitant with a decrease from that of sessile bacteria. Bacterial assemblages were most affected by the 100 mg/L TiO2-NP exposure and overall diversity was found to be lower for planktonic bacteria and higher for sessile bacteria at this concentration. In both compartments, a 100 mg/L TiO2-NPs exposure induced a decrease in the ratio between the Betaproteobacteria and Bacteroidetes. For planktonic communities, a decrease of Comamonadaceae was observed concomitant with an increase of Oxalobacteraceae and Cytophagaceae (especially Emticicia). For sessile communities, results showed a strong decrease of Betaproteobacteria and particularly of Comamonadaceae.
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Stéphane Jomini, Hugues Clivot, Pascale Bauda, Christophe Pagnout. Impact of manufactured TiO2 nanoparticles on planktonic and sessile bacterial communities. Environmental Pollution (1970), Elsevier Science, 2015, 202, pp.196-204. ⟨10.1016/j.envpol.2015.03.022⟩. ⟨hal-01248838⟩



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