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Chemical dispersants can suppress the activity of natural oil-degrading microorganisms Public Deposited

https://ir.library.oregonstate.edu/concern/articles/bn999847x

This is the publisher’s final pdf. The article is published by the National Academy of Sciences and can be found at:  http://www.pnas.org/content/112/48/14900

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  • During the Deepwater Horizon oil well blowout in the Gulf of Mexico, the application of 7 million liters of chemical dispersants aimed to stimulate microbial crude oil degradation by increasing the bioavailability of oil compounds. However, the effects of dispersants on oil biodegradation rates are debated. In laboratory experiments, we simulated environmental conditions comparable to the hydrocarbon-rich, 1,100 m deep plume that formed during the Deepwater Horizon discharge. The presence of dispersant significantly altered the microbial community composition through selection for potential dispersant-degrading Colwellia, which also bloomed in situ in Gulf deep waters during the discharge. In contrast, oil addition to deepwater samples in the absence of dispersant stimulated growth of natural hydrocarbon-degrading Marinobacter. In these deepwater microcosm experiments, dispersants did not enhance heterotrophic microbial activity or hydrocarbon oxidation rates. An experiment with surface seawater from an anthropogenically derived oil slick corroborated the deepwater microcosm results as inhibition of hydrocarbon turnover was observed in the presence of dispersants, suggesting that the microcosm findings are broadly applicable across marine habitats. Extrapolating this comprehensive dataset to real world scenarios questions whether dispersants stimulate microbial oil degradation in deep ocean waters and instead highlights that dispersants can exert a negative effect on microbial hydrocarbon degradation rates.
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  • Kleindienst, S., Seidel, M., Ziervogel, K., Grim, S., Loftis, K., Harrison, S., ... & Joye, S. B. (2015). Chemical dispersants can suppress the activity of natural oil-degrading microorganisms. Proceedings of the National Academy of Sciences, 112(48), 14900-14905. doi:10.1073/pnas.1507380112
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  • 114
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  • 48
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  • This research was supported by a grant from British Petroleum/the Gulf of Mexico Research Initiative to support the "Ecosystem Impacts of Oil and Gas Inputs to the Gulf (ECOGIG)" consortium. P.M.M. also acknowledges funding from the National Science Foundation (OCE-1057683). This is ECOGIG contribution no. 347 and the data are archived at Gulf of Mexico Research Initiative Information and Data Cooperative data set number R1.x132.135:0012.
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  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-06-23T18:25:30Z No. of bitstreams: 2 KleindienstChemicalDispersantsSuppress.pdf: 1725862 bytes, checksum: 525e6e86da43870b4d3f95b9a6b0d53d (MD5) KleindienstChemicalDispersantsSuppressAppendix.pdf: 13973556 bytes, checksum: b03bbed564301bc692857aced26b0ab0 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-06-23T18:26:06Z (GMT) No. of bitstreams: 2 KleindienstChemicalDispersantsSuppress.pdf: 1725862 bytes, checksum: 525e6e86da43870b4d3f95b9a6b0d53d (MD5) KleindienstChemicalDispersantsSuppressAppendix.pdf: 13973556 bytes, checksum: b03bbed564301bc692857aced26b0ab0 (MD5)

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