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Biological responses on C. maenas caused by sediment properties and pH interactions during CO2 leakage events from sub-seabed injection and storage.

AuthorsRodríguez-Romero, Araceli ; Jiménez-Tenorio, Natalia; Riba, Inmaculada ; Blasco, Julián
Issue DateJul-2015
Citation10th Iberian Congress on Environmental Contamination and Toxicology (2015)
7th Iberoamerican Congress on Environmental Contamination and Toxicology (2015)
AbstractCO2 capture and storage in sub-seabed geological formations is proposed as one of the potential options to mitigate the abrupt and irreversible consequences of climate change. However, possible CO2 leakages could occur during the injection and sequestration procedure, provoking significant repercussions on marine environment. In this study, we investigate the toxicity effects of acidification derived from possible CO2 leakage events on the European green crab, Carcinus maenas. To this end, a lab-scale experiment involving direct release of CO2 through marine sediment was conducted at expected scenarios of pH values for this kind of events. Crabs were exposed for 10 days to sediments collected from two different coastal areas, one with relatively uncontaminated sediments (RSP) and the other with known contaminated sediments (MZ and ML), under the pre-established pH conditions (8.0-6.1). End points measured were: survival rate, histopathological damages and metal accumulation (Fe, Mn, Cu, Zn, As, Cr, Cd and Pb) in gills and hepatopancreas. Significant associations were observed between pH and the histological damage. Organic matter and organic carbon content as well as Fe, Mn, Cr, Pb, Cd and PAHs concentrations in sediment presented significant correlation coefficients with the damage to gills and hepatopancreas and metal accumulation in both tissues. The results obtained in this study revealed the importance of sediment properties in the biological effects caused by possible CO2 leakage events derived from the implementation of this mitigation option. However, a clear pattern was not observed between metal accumulation in tissues and pH reduction. Animal ́s avoidance behaviour and tolerance degree to acidification may are confounding factors to assess metal bioaccumulation. Further research to find a suitable organism battery, which allows us to predict the possible consequences on human health derived from metal bioaccumulation associated to high CO2 conditions, is required.
DescriptionTrabajo presentado en el 10th Iberian Congress on Environmental Contamination and Toxicology y el 7th Iberoamerican Congress on Environmental Contamination and Toxicology (CICTA 2015), celebrados en Vila Real (Portugal) del 14 al 17 de julio de 2015.
Appears in Collections:(ICMAN) Comunicaciones congresos
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