|Title||Response of sediment bacterial community to triclosan in subtropical freshwater benthic microcosms|
|Author(s)||Peng, Feng Jiao; Diepens, Noël J.; Pan, Chang Gui; Ying, Guang Guo; Salvito, Daniel; Selck, Henriette; Brink, Paul J. Van den|
|Source||Environmental Pollution 248 (2019). - ISSN 0269-7491 - p. 676 - 683.|
Aquatic Ecology and Water Quality Management
|Publication type||Refereed Article in a scientific journal|
|Availibility||Full text available from 2021-05-01|
|Keyword(s)||Benthic macroinvertebrates - Microcosm - Sediment bacterial community - Toxicity - Triclosan|
The response of sediment bacterial communities in subtropical freshwater benthic microcosms to sediment-associated triclosan (TCS; 28 d exposure) was analysed using Illumina high-throughput sequencing. This study highlights the interactive effects of TCS and the presence of benthic macroinvertebrates (Limnodrilus hoffmeisteri and Viviparidae bellamya) on sediment bacterial communities. Our results show that TCS alone significantly altered the taxonomic composition and decreased alpha diversity of sediment bacterial communities at concentrations ≥80 μg TCS/g dry weight (dw) sediment (sed). Regarding dominant phyla, TCS significantly reduced the relative abundance of Bacteroidetes and Firmicutes at these concentrations, whereas the relative abundance of Chloroflexi and Cyanobacteria increased. In the presence of benthic macroinvertebrates, the sediment bacterial community was affected by 8 μg TCS/g dw sed as well. However, the presence of benthic macroinvertebrates did not cause measurable changes to bacterial community in unspiked (i.e., control) sediment. These results indicate that TCS alone would not alter the sediment bacterial community at environmentally relevant concentrations (up till 8 μg/g dw sed), but may have an effect in combination with the presence of benthic macroinvertebrates. Therefore, we recommend to include benthic macroinvertebrates when assessing the response of sediment bacterial communities during exposure to environmental stress such as organic contaminants.