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Rodrigue M, Elango V, Curtis D, Collins AW, Pardue JH. Biodegradation of MC252 polycyclic aromatic hydrocarbons and alkanes in two coastal wetlands. Mar Pollut Bull 2020; 157:111319. [PMID: 32658684 DOI: 10.1016/j.marpolbul.2020.111319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 05/21/2020] [Accepted: 05/24/2020] [Indexed: 06/11/2023]
Abstract
Complementary microbial and geochemical assessment techniques investigated the biodegradation of PAHs and alkanes in salt marshes impacted by crude oil following the Macondo spill. Contamination was observed in the top 10 cm of the marsh profile based on PAH analysis and measurement of the δ13C signature of impacted marsh soils. Measurement of evolution of 13C depleted CO2 indicated mineralization of crude oil ranging from 2.7-12.1 mg CO2-C/m2-hr. Changes in weathering ratios of alkylated phenanthrenes and dibenzothiophenes indicated loss of these 3-ring PAHs consistent with biodegradation. A diverse microbial population was observed at both locations dominated by Gammaproteobacteria and including known hydrocarbon degraders such as Marinobacter and Alcanivorax. There was shared richness between sites and across seasons but results suggested substantial turnover of phylotypes in space and time. Biodegradation of alkanes and alkylated PAHs occurred when oxygen was provided in laboratory reactors but not in the absence of oxygen.
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Affiliation(s)
- Matthew Rodrigue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - Vijaikrishnah Elango
- Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - David Curtis
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - Autumn W Collins
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - John H Pardue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America; Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States of America.
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Collins AW, Elango V, Curtis D, Rodrigue M, Pardue JH. Biogeochemical controls on biodegradation of buried oil along a coastal headland beach. Mar Pollut Bull 2020; 154:111051. [PMID: 32319893 DOI: 10.1016/j.marpolbul.2020.111051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 03/03/2020] [Accepted: 03/04/2020] [Indexed: 06/11/2023]
Abstract
Laboratory experiments investigated oxygen dynamics in buried oiled sands sampled from areas impacted by the Macondo spill. Measured oxygen fluxes in oil deposits that were permeable to tidal water ranged from 10-3 to 10-4 μmol/cm2-sec, orders of magnitude higher than fluxes in non-permeable deposits (10-6 to 10-7 μmol/cm2-sec). Oxygen dynamics were well described by 1-d models that represent increased oxygen consumption in oiled sands. Experiments demonstrated that when oxygen is present and the oil deposit is permeable to tidal water, biodegradation of alkylated phenanthrenes and dibenzothiophenes proceeded over time scales (i.e., weeks) to have a significant impact on the mass and quality of buried oil. For this biodegradation process to proceed, two independent conditions must be met, a source of oxygenated water has to be present (e.g., tidal flushing in the intertidal zone) and the oiled deposit has to be permeable to water (i.e., pores cannot be completely saturated with oil).
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Affiliation(s)
- Autumn Westrick Collins
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - Vijaikrishnah Elango
- Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - David Curtis
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - Matthew Rodrigue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America
| | - John H Pardue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States of America; Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States of America.
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Curtis D, Elango V, Collins AW, Rodrigue M, Pardue JH. Transport of crude oil and associated microbial populations by washover events on coastal headland beaches. Mar Pollut Bull 2018; 130:229-239. [PMID: 29866552 DOI: 10.1016/j.marpolbul.2018.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 02/26/2018] [Accepted: 03/05/2018] [Indexed: 06/08/2023]
Abstract
Storm-driven transport of MC252 oil, sand and shell aggregates was studied on a low-relief coastal headland beach in Louisiana, USA including measurement of alkylated PAHs and Illumina sequencing of intra-aggregate microbial populations. Weathering ratios, constructed from alkylated PAH data, were used to assess loss of 3-ring phenanthrenes and dibenzothiophenes relative to 4-ring chrysenes. Specific aggregate types showed relatively little weathering of 3-ring PAHs referenced to oil sampled near the Macondo wellhead with the exception of certain SRBs sampled from the supratidal environment and samples from deposition areas north of beach. Aggregates mobilized by these storm-driven washover events contains diverse microbial populations dominated by the class Gammaproteobacteria including PAH-degrading genera such as Halomonas, Marinobacter and Idiomarina. Geochemical assessment of porewater in deposition areas, weathering observations, and microbial data suggest that storm remobilization can contribute to susceptibility of PAHs to biodegradation by moving oil to beach microenvironments with more favorable characteristics. (149).
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Affiliation(s)
- David Curtis
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Vijaikrishnah Elango
- Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Autumn W Collins
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Matthew Rodrigue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - John H Pardue
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, United States; Hazardous Substance Research Center, Louisiana State University, Baton Rouge, LA 70803, United States.
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Horak KE, Bursian SJ, Ellis CK, Dean KM, Link JE, Hanson-Dorr KC, Cunningham FL, Harr KE, Pritsos CA, Pritsos KL, Healy KA, Cacela D, Shriner SA. Toxic effects of orally ingested oil from the Deepwater Horizon spill on laughing gulls. Ecotoxicol Environ Saf 2017; 146:83-90. [PMID: 28823381 DOI: 10.1016/j.ecoenv.2017.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 07/05/2017] [Accepted: 07/07/2017] [Indexed: 06/07/2023]
Abstract
The explosion of the Deepwater Horizon oil rig released, millions of gallons of oil into the environment, subsequently exposing wildlife, including numerous bird species. To determine the effects of MC252 oil to species relevant to the Gulf of Mexico, studies were done examining multiple exposure scenarios and doses. In this study, laughing gulls (Leucophaeus atricilla, LAGU) were offered fish injected with MC252 oil at target doses of 5 or 10mL/kg bw per day. Dosing continued for 27 days. Of the adult, mixed-sex LAGUs used in the present study, ten of 20 oil exposed LAGUs survived to the end of the study; a total of 10 of the oil exposed LAGUs died or were euthanized within 20 days of initiation of the study. Endpoints associated with oxidative stress, hepatic total glutathione (tGSH), oxidized glutathione (GSSG) and reduced glutathione (rGSH) significantly increased as mean dose of oil increased, while the rGSH:GSSG ratio showed a non-significant negative trend with oil dose. A significant increase in 3-methyl histidine was found in oil exposed birds when compared to controls indicative of muscle wastage and may have been associated with the gross observation of diminished structural integrity in cardiac tissue. Consistent with previous oil dosing studies in birds, significant changes in liver, spleen, and kidney weight when normalized to body weight were observed. These studies indicate that mortality in response to oil dosing is relatively common and the mortality exhibited by the gulls is consistent with previous studies examining oil toxicity. Whether survival effects in the gull study were associated with weight loss, physiologic effects of oil toxicity, or a behavioral response that led the birds to reject the dosed fish is unknown.
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Affiliation(s)
- K E Horak
- USDA APHIS National Wildlife Research Center, Fort Collins, CO, United States.
| | - S J Bursian
- Department of Animal Science, Michigan State University, East Lansing, MI, United States
| | - C K Ellis
- USDA APHIS National Wildlife Research Center, Fort Collins, CO, United States
| | - K M Dean
- Abt Associates, Boulder, CO, United States
| | - J E Link
- Department of Animal Science, Michigan State University, East Lansing, MI, United States
| | - K C Hanson-Dorr
- USDA APHIS National Wildlife Research Center, Mississippi Field Station, Mississippi State University, Starkville, MS, United States
| | - F L Cunningham
- USDA APHIS National Wildlife Research Center, Mississippi Field Station, Mississippi State University, Starkville, MS, United States
| | - K E Harr
- Urika Pathology, LLC, Mukilteo, WA, United States
| | - C A Pritsos
- Department of Agriculture, Nutrition, and Veterinary Science, University of Nevada, Reno, Reno, NV, United States
| | - K L Pritsos
- Department of Agriculture, Nutrition, and Veterinary Science, University of Nevada, Reno, Reno, NV, United States
| | - K A Healy
- US Fish and Wildlife Service, Deepwater Horizon Natural Resource Damage Assessment and Restoration Office, Fairhope, AL, United States
| | - D Cacela
- Abt Associates, Boulder, CO, United States
| | - S A Shriner
- USDA APHIS National Wildlife Research Center, Fort Collins, CO, United States
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