We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
One-Time Addition of Nano-TiO Triggers Short-Term Responses in Benthic Bacterial Communities in Artificial Streams.
- Authors
Ozaki, Alexandra; Adams, Erin; Binh, Chu; Tong, Tiezheng; Gaillard, Jean-François; Gray, Kimberly; Kelly, John
- Abstract
Nano-TiO is an engineered nanomaterial whose production and use are increasing rapidly. Hence, aquatic habitats are at risk for nano-TiO contamination due to potential inputs from urban and suburban runoff and domestic wastewater. Nano-TiO has been shown to be toxic to a wide range of aquatic organisms, but little is known about the effects of nano-TiO on benthic microbial communities. This study used artificial stream mesocosms to assess the effects of a single addition of nano-TiO (P25 at a final concentration of 1 mg l) on the abundance, activity, and community composition of sediment-associated bacterial communities. The addition of nano-TiO resulted in a rapid (within 1 day) decrease in bacterial abundance in artificial stream sediments, but bacterial abundance returned to control levels within 3 weeks. Pyrosequencing of partial 16S rRNA genes did not indicate any significant changes in the relative abundance of any bacterial taxa with nano-TiO treatment, indicating that nano-TiO was toxic to a broad range of bacterial taxa and that recovery of the bacterial communities was not driven by changes in community composition. Addition of nano-TiO also resulted in short-term increases in respiration rates and denitrification enzyme activity, with both returning to control levels within 3 weeks. The results of this study demonstrate that single-pulse additions of nano-TiO to aquatic habitats have the potential to significantly affect the abundance and activity of benthic microbial communities and suggest that interactions of TiO nanoparticles with environmental matrices may limit the duration of their toxicity.
- Subjects
BACTERIAL communities; BENTHIC ecology; TITANIUM dioxide nanoparticles; PYROSEQUENCING; RIVER sediments; RIBOSOMAL RNA
- Publication
Microbial Ecology, 2016, Vol 71, Issue 2, p266
- ISSN
0095-3628
- Publication type
Article
- DOI
10.1007/s00248-015-0646-z