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Compositional alterations in soil bacterial communities exposed to TiO2 nanoparticles are not reflected in functional impacts

Research output: Contribution to journalArticle

  • Yujia Zhai
  • Ellard R. Hunting
  • Gang Liu
  • Elise Baas
  • Willie J.G.M. Peijnenburg
  • Martina G. Vijver
Original languageEnglish
Article number108713
Number of pages9
JournalEnvironmental Research
Volume178
Early online date2 Sep 2019
DOIs
DateAccepted/In press - 31 Aug 2019
DateE-pub ahead of print - 2 Sep 2019
DatePublished (current) - 1 Nov 2019

Abstract

Titanium dioxide nanoparticles (TiO2NP) are increasingly released in soil ecosystems, while there is limited understanding of the impacts of TiO2NP on soil bacterial communities. Here we investigated the effects of TiO2NP on the taxonomic composition and functional profile of a soil bacterial community over a 60-day exposure period. In short-term exposure (1-day), contradictory effects on the taxonomic composition of soil bacterial communities were found after exposure to a low realistic environmental concentration of TiO2NP at 1 mg/kg as compared to the effects induced by medium and high concentrations of TiO2NP at 500 and 2000 mg/kg. After long-term exposure (60-day), the negative effects of TiO2NP at the low concentration disappeared, and the inhibition by TiO2NP of the abundance of core taxa was enhanced along with increasing exposure concentrations. However, although significant alterations were observed in the taxonomic composition over time and exposure concentrations, no significant change was observed in the community functional profile as well as enzyme activity after 60-day exposure, indicating that functional redundancy likely contributed to the bacterial community tolerance after the exposure to TiO2NP. Our study highlighted the importance of assessing bacterial community compositional and functional responses in assessing the environmental risk of nanoparticles on soil ecosystems.

    Research areas

  • Functional redundancy, Soil bacterial community, Taxonomic composition, Time-dependent impacts, TiO2NP

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0013935119305109#! . Please refer to any applicable terms of use of the publisher.

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