Effects of dispersants and biosurfactants on crude-oil biodegradation and bacterial community succession

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dc.contributor.authorThomas, Gareth E.
dc.contributor.authorBrant, Jan L.
dc.contributor.authorCampo, Pablo
dc.contributor.authorClark, Dave R.
dc.contributor.authorCoulon, Frederic
dc.contributor.authorGregson, Benjamin H.
dc.contributor.authorMcGenity, Terry J.
dc.contributor.authorMcKew, Boyd A.
dc.date.accessioned2021-06-04T10:47:26Z
dc.date.available2021-06-04T10:47:26Z
dc.date.issued2021-06-01
dc.description.abstractThis study evaluated the effects of three commercial dispersants (Finasol OSR 52, Slickgone NS, Superdispersant 25) and three biosurfactants (rhamnolipid, trehalolipid, sophorolipid) in crude-oil seawater microcosms. We analysed the crucial early bacterial response (1 and 3 days). In contrast, most analyses miss this key period and instead focus on later time points after oil and dispersant addition. By focusing on the early stage, we show that dispersants and biosurfactants, which reduce the interfacial surface tension of oil and water, significantly increase the abundance of hydrocarbon-degrading bacteria, and the rate of hydrocarbon biodegradation, within 24 h. A succession of obligate hydrocarbonoclastic bacteria (OHCB), driven by metabolite niche partitioning, is demonstrated. Importantly, this succession has revealed how the OHCB Oleispira, hitherto considered to be a psychrophile, can dominate in the early stages of oil-spill response (1 and 3 days), outcompeting all other OHCB, at the relatively high temperature of 16 °C. Additionally, we demonstrate how some dispersants or biosurfactants can select for specific bacterial genera, especially the biosurfactant rhamnolipid, which appears to provide an advantageous compatibility with Pseudomonas, a genus in which some species synthesize rhamnolipid in the presence of hydrocarbons.en_UK
dc.identifier.citationThomas GE, Brant JL, Moreno P, et al., (2021) Effects of dispersants and biosurfactants on crude-oil biodegradation and bacterial community succession. Microorganisms, Volume 9, Issue 6, June 2021, Article number 1200en_UK
dc.identifier.issn2076-2607
dc.identifier.urihttps://doi.org/10.3390/microorganisms9061200
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16735
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectdispersantsen_UK
dc.subjectbiosurfactantsen_UK
dc.subjectbacteriaen_UK
dc.subjectOHCBen_UK
dc.subjectOleispiraen_UK
dc.subjectPseudomonasen_UK
dc.subjecthydrocarbonsen_UK
dc.subjectoilen_UK
dc.titleEffects of dispersants and biosurfactants on crude-oil biodegradation and bacterial community successionen_UK
dc.typeArticleen_UK

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