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Linking subcellular metal partitioning to the particulate and dissolved exposure pathways and chronic effect of copper in two deposit feeder organisms

AutorCampana, Olivia ; Taylor, Anne M.; Blasco, Julián ; Simpson, Stuart L.
Fecha de publicaciónmay-2012
Citación6th SETAC World Congress (2012)
SETAC Europe 22nd Annual Meeting (2012)
ResumenIn toxicity assessment, increasing importance is being placed on determining tissue metal residues-effect relationships that result from environmental exposure. Toxic effects are elicited when a critical dose of a chemical is reached in one or more sensitive compartments of the organism. However, it is well recognised that, following uptake, metals may partition within different subcellular tissues, be detoxified or excreted, but only the metabolically active fraction of metal contributes to toxicity. The present study investigates the links between the subcellular metal exposure and toxic effect to reproduction of the epibenthic amphipod Melita plumulosa and growth of the bivalve Tellina deltoidalis exposed to copper-contaminated sediments with varying properties (particulate organic carbon (POC) content and/or fraction of fine particles). The subcellular partitioning of copper was determined for both organisms and residue-effect relationships investigated. The results highlighted: i) strong correlation between total copper bioaccumulation and both POC-normalization copper concentration of the <63 μm sediment fraction and copper concentration in overlying water for both organisms (M. plumulosa rsed=0. 87, p<0.001; rOLW=0. 84, p<0.01; T. deltoidalis rsed=0.93, p<0.001; rOLW=0. 96, p<0.001); ii) significant correlation between the metabolically available fraction of copper and normalized sediment copper concentration for both organisms (M. plumulosa r=0.79, p<0.01; T. deltoidalis r=0.67, p<0.05); the correlation was quite weaker for M. plumulosa between the metabolically available fraction and copper concentration in the overlying water (r=0.64, p<0.5, df=9) but stronger for T. deltoidalis (r=0.92, p<0.001); iii) strong linear relationship between the compartment of copper biologically detoxified within T. deltoidalis and both the %-POC/silt normalized sediment copper concentration (r=0.91, p<0.001) and copper concentration in the water phase (r=0.85, p<0.001); iv) strong correlation (r=-0.83, p<0.01) between sublethal effect and metabolically available fraction for M. plumulosa. Copper associated with the particulate phase has been demonstrated to be the major exposure route and potential cause of the toxicity for M. plumulosa. However, in T. deltoidalis, particulate and dissolved exposure routes seem to play both an important role in copper uptake. These results provide further insight into the interaction between tissue residues and chronic effects.
DescripciónTrabajo presentado en el 6th SETAC World Congress (2012), celebrado en Berlín del 20 al 24 de mayo de 2012.
Aparece en las colecciones: (ICMAN) Comunicaciones congresos
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