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Fate of petroleum hydrocarbons in bioturbated pristine sediments from Caleta Valdés (Patagonia Argentina): An ex situ bioassay

Sturla Lompré, Julieta and Nievas, Marina and Franco, Marcos and Grossi, Vincent and Ferrando, Agustina and Militon, Cécile and Gilbert, Franck and Cuny, Philippe and Stora, Georges and Sepúlveda, Marcela and Esteves, José Luis and Commendatore, Marta Fate of petroleum hydrocarbons in bioturbated pristine sediments from Caleta Valdés (Patagonia Argentina): An ex situ bioassay. (2018) Ecotoxicology and Environmental Safety, 162. 673-682. ISSN 01476513

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Official URL: https://doi.org/10.1016/j.ecoenv.2018.06.069


Petroleum can pollute pristine shorelines as a consequence of accidental spills or chronic leaks. In this study, the fate of petroleum hydrocarbons in soft pristine sediment of Caleta Valdés (Argentina) subject toex situsimulated oil pollution was assessed. Sedimentary columns were exposed to medium and high concentrations of Escalante Crude Oil (ECO) and incubated in the laboratory during 30 days. Levels of aliphatic hydrocarbons at different depths of the sedimentary column were determined by gas chromatography. Oil penetration was limited to the first three centimetres in both treatments, and under this depth, hydrocarbons were clearly biogenic (terrestrial plants) as in the whole sedimentary column of the control assay. Bioturbation by macrobenthic infauna was strongly impacted by oil pollution which resulted in reduced sediment oxygenation and low burial of petroleum hydrocarbons. This may partly explain the limited hydrocarbon biodegradation observed, as indicated by the relatively high values of the ratios nC17/pristane,nC18/phytane, and total resolved aliphatic hydrocarbons/ unresolved complex mixture. Correspondingly, at the end of the experiment the most probable number of hydrocarbon-degrading bacteria reached ~ 10^3 MPN g−1 dry weight. These values were lower than those found in chronically polluted coastal sediments, reflecting a low activity level of the oil-degrading community. The results highlight the low attenuation capacities of Caleta Valdés pristine sediments to recover its original characteristics in a short time period if an oil spill occurs. In this work, we present a novel and integrative tool to evaluate the fate of petroleum hydrocarbons and their potential damage on pristine sediments.

Item Type:Article
HAL Id:hal-02095651
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Aix-Marseille Université - AMU (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Normale Supérieure de Lyon - ENS de Lyon (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universidad Tecnologica Nacional - UTN (ARGENTINA)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
Other partners > Université du Sud Toulon-Var - USTV (FRANCE)
Other partners > Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET (ARGENTINA)
Laboratory name:
Coopération Scientifique Sud and Ministerio de Ciencia, Tecnología e Innovación Productiva de la Nación - Agencia Nacional de Promoción Científica y Técnológica - Secretaría de Ciencia, Tecnología e Innovación Productiva de la Provincia del Chubut
Deposited On:10 Apr 2019 14:02

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