Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C
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Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C. / Gomes, Ana; Christensen, Jan H; Gründger, Friederike; Kjeldsen, Kasper Urup; Rysgaard, Søren; Vergeynst, Leendert.
In: Chemosphere, Vol. 286, No. Part 3, 131751, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Biodegradation of water-accommodated aromatic oil compounds in Arctic seawater at 0 °C
AU - Gomes, Ana
AU - Christensen, Jan H
AU - Gründger, Friederike
AU - Kjeldsen, Kasper Urup
AU - Rysgaard, Søren
AU - Vergeynst, Leendert
N1 - Copyright © 2021 Elsevier Ltd. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Oil spills in Arctic marine environments are expected to increase concurrently with the expansion of shipping routes and petroleum exploitation into previously inaccessible ice-dominated regions. Most research on oil biodegradation focusses on the bulk oil, but the fate of the water-accommodated fraction (WAF), mainly composed of toxic aromatic compounds, is largely underexplored. To evaluate the bacterial degradation capacity of such dissolved aromatics in Greenlandic seawater, microcosms consisting of 0 °C seawater polluted with WAF were investigated over a 3-month period. With a half-life (t1/2) of 26 days, m-xylene was the fastest degraded compound, as measured by gas chromatography - mass spectrometry. Substantial slower degradation was observed for ethylbenzene, naphthalenes, phenanthrene, acenaphthylene, acenaphthene and fluorenes with t1/2 of 40-105 days. Colwellia, identified by 16S rRNA gene sequencing, was the main potential degrader of m-xylene. This genus occupied up to 47 % of the bacterial community until day 10 in the microcosms. Cycloclasticus and Zhongshania aliphaticivorans, potentially utilizing one-to three-ringed aromatics, replaced Colwellia between day 10 and 96 and occupied up to 6 % and 23 % of the community, respectively. Although most of the WAF can ultimately be eliminated in microcosms, our results suggest that the restoration of an oil-impacted Arctic environment may be slow as most analysed compounds had t1/2 of over 2-3 months and the detrimental effects of a spill towards the marine ecosystem likely persist during this time.
AB - Oil spills in Arctic marine environments are expected to increase concurrently with the expansion of shipping routes and petroleum exploitation into previously inaccessible ice-dominated regions. Most research on oil biodegradation focusses on the bulk oil, but the fate of the water-accommodated fraction (WAF), mainly composed of toxic aromatic compounds, is largely underexplored. To evaluate the bacterial degradation capacity of such dissolved aromatics in Greenlandic seawater, microcosms consisting of 0 °C seawater polluted with WAF were investigated over a 3-month period. With a half-life (t1/2) of 26 days, m-xylene was the fastest degraded compound, as measured by gas chromatography - mass spectrometry. Substantial slower degradation was observed for ethylbenzene, naphthalenes, phenanthrene, acenaphthylene, acenaphthene and fluorenes with t1/2 of 40-105 days. Colwellia, identified by 16S rRNA gene sequencing, was the main potential degrader of m-xylene. This genus occupied up to 47 % of the bacterial community until day 10 in the microcosms. Cycloclasticus and Zhongshania aliphaticivorans, potentially utilizing one-to three-ringed aromatics, replaced Colwellia between day 10 and 96 and occupied up to 6 % and 23 % of the community, respectively. Although most of the WAF can ultimately be eliminated in microcosms, our results suggest that the restoration of an oil-impacted Arctic environment may be slow as most analysed compounds had t1/2 of over 2-3 months and the detrimental effects of a spill towards the marine ecosystem likely persist during this time.
U2 - 10.1016/j.chemosphere.2021.131751
DO - 10.1016/j.chemosphere.2021.131751
M3 - Journal article
C2 - 34399257
VL - 286
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
IS - Part 3
M1 - 131751
ER -
ID: 276623413