Cold sediment microbial community shifts in response to crude oil water-accommodated fraction with or without dispersant: a microcosm study - Université de Pau et des Pays de l'Adour Accéder directement au contenu
Article Dans Une Revue Environmental Science and Pollution Research Année : 2023

Cold sediment microbial community shifts in response to crude oil water-accommodated fraction with or without dispersant: a microcosm study

Résumé

In cold environments, the low temperature slows down microbial metabolisms, such as the biodegradation processes of hydrocarbons, which are often stimulated by the addition of dispersants in oil spill disasters. In this study, we investigated the effects of hydrocarbon water-accommodated fraction (WAF) prepared with and without dispersant on benthic microbial communities in a microcosm experiment in which hydrocarbon removal was observed. Both WAFs contained similar polycyclic aromatic hydrocarbon (PAH) content. The microcosm experiment, set up with either pristine or contaminated sediments, was conducted for 21 days at 4 °C under WAF and WAF + dispersant conditions. The behavior of bacterial communities in response to WAF and WAF + dispersant was examined at both DNA and RNA levels, revealing the effect of WAF and WAF + dispersant on the resident and active communities respectively. The contaminated sediment showed less taxa responsive to the addition of both WAF and WAF + dispersant than the pristine sediment, indicating the legacy effect by the presence hydrocarbon-degrading and dispersant-resistant taxa inhabiting the contaminated sediment.
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Dates et versions

hal-04532146 , version 1 (04-04-2024)

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Tamer Hafez, Maren Ortiz-Zarragoitia, Christine Cagnon, Cristiana Cravo-Laureau, Robert Duran. Cold sediment microbial community shifts in response to crude oil water-accommodated fraction with or without dispersant: a microcosm study. Environmental Science and Pollution Research, 2023, 30 (15), pp.44640-44656. ⟨10.1007/s11356-023-25264-6⟩. ⟨hal-04532146⟩
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