Thomas, Gareth E and Brant, Jan L and Campo, Pablo and Clark, Dave R and Coulon, Frederic and Gregson, Benjamin H and McGenity, Terry J and McKew, Boyd A (2021) Effects of Dispersants and Biosurfactants on Crude-Oil Biodegradation and Bacterial Community Succession. Microorganisms, 9 (6). p. 1200. DOI https://doi.org/10.3390/microorganisms9061200
Thomas, Gareth E and Brant, Jan L and Campo, Pablo and Clark, Dave R and Coulon, Frederic and Gregson, Benjamin H and McGenity, Terry J and McKew, Boyd A (2021) Effects of Dispersants and Biosurfactants on Crude-Oil Biodegradation and Bacterial Community Succession. Microorganisms, 9 (6). p. 1200. DOI https://doi.org/10.3390/microorganisms9061200
Thomas, Gareth E and Brant, Jan L and Campo, Pablo and Clark, Dave R and Coulon, Frederic and Gregson, Benjamin H and McGenity, Terry J and McKew, Boyd A (2021) Effects of Dispersants and Biosurfactants on Crude-Oil Biodegradation and Bacterial Community Succession. Microorganisms, 9 (6). p. 1200. DOI https://doi.org/10.3390/microorganisms9061200
Abstract
This 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.
Item Type: | Article |
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Uncontrolled Keywords: | dispersants; biosurfactants; bacteria; OHCB; Oleispira; Pseudomonas; hydrocarbons; oil |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 07 Jun 2021 20:29 |
Last Modified: | 07 Aug 2024 19:27 |
URI: | http://repository.essex.ac.uk/id/eprint/30575 |
Available files
Filename: microorganisms-09-01200-v2.pdf
Licence: Creative Commons: Attribution 3.0