Hydrocarbon contamination affects deep-sea benthic oxygen uptake and microbial community composition
Hydrocarbon contamination affects deep-sea benthic oxygen uptake and microbial community composition
Accidental oil well blowouts have the potential to introduce large quantities of hydrocarbons into the deep sea and disperse toxic contaminants to midwater and seafloor areas over ocean-basin scales. Our ability to assess the environmental impacts of these events is currently impaired by our limited understanding of how resident communities are affected. This study examined how two treatment levels of a water accommodated fraction of crude oil affected the oxygen consumption rate of a natural, deep-sea benthic community. We also investigated the resident microbial community’s response to hydrocarbon contamination through quantification of phospholipid fatty acids (PLFAs) and their stable carbon isotope (?13C) values. Sediment community oxygen consumption rates increased significantly in response to increasing levels of contamination in the overlying water of oil-treated microcosms, and bacterial biomass decreased significantly in the presence of oil. Multivariate ordination of PLFA compositional (mol%) data showed that the structure of the microbial community changed in response to hydrocarbon contamination. However, treatment effects on the ?13C values of individual PLFAs were not statistically significant. Our data demonstrate that deep-sea benthic microbes respond to hydrocarbon exposure within 36 h.
Benthic respiration, Experimental incubations, PLFA, Blowout, Contamination, Bacteria, Remineralisation
79-87
Main, C.E.
0a5d6d23-b877-4767-8881-70b11847a14b
Ruhl, H.A.
177608ef-7793-4911-86cf-cd9960ff22b6
Jones, D.O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017
Thornton, B.
ae7b338f-3326-4db1-b6d5-de09a960287b
Mayor, D.J.
461ddc80-a25d-45b5-873f-9cbf4aa93828
June 2015
Main, C.E.
0a5d6d23-b877-4767-8881-70b11847a14b
Ruhl, H.A.
177608ef-7793-4911-86cf-cd9960ff22b6
Jones, D.O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017
Thornton, B.
ae7b338f-3326-4db1-b6d5-de09a960287b
Mayor, D.J.
461ddc80-a25d-45b5-873f-9cbf4aa93828
Main, C.E., Ruhl, H.A., Jones, D.O.B., Yool, A., Thornton, B. and Mayor, D.J.
(2015)
Hydrocarbon contamination affects deep-sea benthic oxygen uptake and microbial community composition.
Deep Sea Research Part I: Oceanographic Research Papers, 100, .
(doi:10.1016/j.dsr.2014.12.008).
Abstract
Accidental oil well blowouts have the potential to introduce large quantities of hydrocarbons into the deep sea and disperse toxic contaminants to midwater and seafloor areas over ocean-basin scales. Our ability to assess the environmental impacts of these events is currently impaired by our limited understanding of how resident communities are affected. This study examined how two treatment levels of a water accommodated fraction of crude oil affected the oxygen consumption rate of a natural, deep-sea benthic community. We also investigated the resident microbial community’s response to hydrocarbon contamination through quantification of phospholipid fatty acids (PLFAs) and their stable carbon isotope (?13C) values. Sediment community oxygen consumption rates increased significantly in response to increasing levels of contamination in the overlying water of oil-treated microcosms, and bacterial biomass decreased significantly in the presence of oil. Multivariate ordination of PLFA compositional (mol%) data showed that the structure of the microbial community changed in response to hydrocarbon contamination. However, treatment effects on the ?13C values of individual PLFAs were not statistically significant. Our data demonstrate that deep-sea benthic microbes respond to hydrocarbon exposure within 36 h.
Text
1-s2.0-S0967063715000023-main.pdf
- Version of Record
More information
Accepted/In Press date: 7 January 2015
Published date: June 2015
Keywords:
Benthic respiration, Experimental incubations, PLFA, Blowout, Contamination, Bacteria, Remineralisation
Organisations:
Marine Systems Modelling, Ocean and Earth Science, Marine Biogeochemistry
Identifiers
Local EPrints ID: 373352
URI: http://eprints.soton.ac.uk/id/eprint/373352
ISSN: 0967-0637
PURE UUID: 2a48c021-6153-4c8f-a3ff-fb0f8b050bb0
Catalogue record
Date deposited: 15 Jan 2015 13:51
Last modified: 14 Mar 2024 18:52
Export record
Altmetrics
Contributors
Author:
C.E. Main
Author:
H.A. Ruhl
Author:
D.O.B. Jones
Author:
A. Yool
Author:
B. Thornton
Author:
D.J. Mayor
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics