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Oil spill effects on macrofaunal communities and bioturbation of pristine marine sediments (Caleta Valdés, Patagonia, Argentina): experimental evidence of low resistance capacities of benthic systems without history of pollution

Ferrando, Agustina and Gonzalez, Emilia and Franco, Marcos and Commendatore, Marta and Nievas, Marina and Militon, Cécile and Stora, Georges and Gilbert, Franck and Esteves, José Luis and Cuny, Philippe Oil spill effects on macrofaunal communities and bioturbation of pristine marine sediments (Caleta Valdés, Patagonia, Argentina): experimental evidence of low resistance capacities of benthic systems without history of pollution. (2015) Environmental Science and Pollution Research, 22 (20). 15294-15306. ISSN 0944-1344

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Official URL: http://dx.doi.org/10.1007/s11356-015-4167-6

Abstract

The Patagonian coast is characterized by the existence of pristine ecosystems which may be particularly sensitive to oil contamination. In this study, a simulated oil spill at acute and chronic input levels was carried out to assess the effects of contamination on the macrobenthic community structure and the bioturbation activity of sediments sampled in Caleta Valdés creek. Superficial sediments were either noncontaminated or contaminated by Escalante crude oil and incubated in the laboratory for 30 days. Oil contamination induced adverse effects on macrobenthic community at both concentrations with, for the highest concentration, a marked decrease of approximately 40 and 55%of density and specific richness, respectively. Besides the disappearance of sensitive species, some other species like Oligochaeta sp. 1, Paranebalia sp., and Ostracoda sp. 2 species have a higher resistance to oil contamination. Sediment reworking activity was also affected by oil addition. At the highest level of contamination, nearly no activity was observed due to the high mortality of macroorganisms. The results strongly suggest that an oil spill in this protected marine area with no previous history of contamination would have a deep impact on the non-adapted macrobenthic community.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The original PDF of the article can be found at Environmental Science and Pollution Research website : http://link.springer.com/journal/11356
HAL Id:hal-01223400
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)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universidad Tecnologica Nacional - UTN (ARGENTINA)
Other partners > Université du Sud Toulon-Var - USTV (FRANCE)
Other partners > Centro Nacional Patagonico - CENPAT (ARGENTINA)
Other partners > Universidad Nacional de la Patagonia San Juan Bosco - UNPSJB (ARGENTINA)
Laboratory name:
Funders:
ECOS-SUD - MINCyT - ANR CESA
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Deposited By: Franck Gilbert
Deposited On:02 Nov 2015 14:45

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