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• W4280605280 endingPage "113467" @default.
• W4280605280 startingPage "113467" @default.
• W4280605280 abstract "Dispersants, used for combating oil spills, increase hydrocarbon bioavailability promoting their biodegradation. Oil weathering process introduces harmful soluble hydrocarbons, such as polycyclic aromatic hydrocarbons (PAHs), into the water column, resulting in water-accommodated fraction (WAF). The presence of dispersants can influence the weathering process by increasing PAHs solubility, toxicity and biodegradability. However, little is known on how dispersants affect microbial communities and their degradation capacities, especially in cold environment where low temperature decreases microbial activity and thus hydrocarbon degradation. Here, we investigated the microbial community dynamics in cold water contaminated by WAF prepared from crude oil with or without a commercial dispersant (Finasol OSR52). The WAFs, prepared with Naphthenic North Atlantic crude oil, were used to contaminate seawater from Norwegian cold sites, one oil-contaminated and the other pristine. The WAF-contaminated seawaters were maintained in microcosms at 4 °C for 21 days. The content of PAHs and microbial compositions (16S rRNA gene sequencing) were determined at days 0, 7, 14 and 21. In addition, the 96 h toxicity assay with adult Acartia tonsa revealed WAFs toxicity at days 0 and 21. The toxicity of WAF mixtures, with and without dispersant, against Acartia tonsa was reduced during the experiment, but PAHs removal was not increased. The water from the oil-contaminated site showed the highest PAHs removal revealing legacy effect (presence of microorganisms adapted to PAHs). Additionally, our results reveal: i) microbial community plasticity allowing the adaptation to the presence of PAHs and dispersant, ii) specific bacteria taxa probably involved in PAHs degradation, and iii) dispersants shape the microbial communities dynamics by stimulating potential dispersant-degrading taxa, such as Fusibacter. Thus, our results provide valuable insights on the role of microbial community in determining the fate of water-solubilized hydrocarbon in cold environment while questioning the role of dispersant used for fighting oil spill." @default.
• W4280605280 created "2022-05-22" @default.
• W4280605280 creator A5003333395 @default.
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• W4280605280 creator A5063918302 @default.
• W4280605280 creator A5067595118 @default.
• W4280605280 date "2022-09-01" @default.
• W4280605280 modified "2023-10-12" @default.
• W4280605280 title "Legacy and dispersant influence microbial community dynamics in cold seawater contaminated by crude oil water accommodated fractions" @default.
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• W4280605280 doi "https://doi.org/10.1016/j.envres.2022.113467" @default.
• W4280605280 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35588780" @default.
• W4280605280 hasPublicationYear "2022" @default.
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• W4280605280 hasAuthorship W4280605280A5003333395 @default.
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• W4280605280 hasAuthorship W4280605280A5063918302 @default.

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