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Revista internacional de contaminación ambiental
versión impresa ISSN 0188-4999
Rev. Int. Contam. Ambient vol.21 no.2 Ciudad de México abr./jun. 2005
Articles
MEAN LETHAL BODY CONCENTRATION OF CADMIUM IN Crassostrea virginica FROM A MEXICAN TROPICAL COASTAL LAGOON
1Departamento de Hidrobiología, UAM, Apartado Postal 55-535, Iztapalapa 09340, México, D. F. Estudiante del Programa de Doctorado en Ciencias Biológicas, UAM. Correo electrónico: gube@xanum.uam.mx
2Instituto de Ciencias del Mar y Limnología, UNAM, México, Apartado Postal 70305, Coyoacán 04510, México, D.F.
The acute effect of cadmium on Crassostrea virginica from the Mandinga Lagoon, México, was evaluated and related to corporal metal accumulation. The bioassay was performed with oysters exposed to lethal Cd concentrations, at temperature of 24.13 °C and salinity of 22.54 %o. The exposed organisms accumulated from 261.20 to 508.80 µgCd/g dry weight in average. The metal incorporated in organisms exposed to the highest Cd concentration was superior in oysters which died during the experiment, than in survivors. However biococentration factor was lower in the highest Cd concentrations. There was weight loss associated to the exposition and it was greater in survivors. Deterioration could be related to a greater metabolic effort to compensate the entrance of Cd. The mean lethal concentration, CdLC50-72h=24.87 mg/L, and the mean lethal body concentration, CdLBC50-72h=502.25 µg/g (4.47 µmol/g), had good adjustments to the Probit model. The body concentration, the bioconcentration factor and the LBC50 associated to the physical and chemical parameter values, particularly salinity and temperature, could constitute useful tools in the evaluation of the cadmium adverse effects in Mexican coastal areas.
Keywords: oyster; metals; bioconcentration; Mandinga lagoon
Se evaluó el efecto agudo del cadmio en Crassostrea virginica de la laguna de Mandin ga y fue relacionado con la acumulación corporal del metal. El bioensayo fue llevado a cabo con ostiones expuestos a concentraciones letales de Cd a temperatura de 24.13 °C y salinidad de 22.54 %o. Los organismos expuestos acumularon de 261.20 a 508.80 µgCd/ g de peso seco en promedio. La acumulación del metal en ostiones expuestos a la concentración más alta de Cd, fue superior en los ostiones muertos durante el experimento, que en los sobrevivientes. Sin embargo, el factor de bioconcentración fue menor en las mayores concentraciones de Cd. Hubo pérdida de peso asociada a la exposición y ésta fue mayor en los sobrevivientes. El deterioro podría relacionarse con un mayor esfuerzo metabólico para compensar la entrada de Cd. La concentración letal media CLCd50 72h=24.87 mg/L y la concentración corporal letal media CCLCd50-72h=502.25 µg/g 50-72h 50-72h (4.47 µmol/g), tuvieron buen ajuste al modelo Probit. La concentración corporal, el factor de bioconcentración y la CCL50 asociadas a los valores de los parámetros fisicoquímicos, particularmente a la salinidad y a la temperatura pueden constituir herramientas útiles en la evaluación de los efectos adversos del cadmio en áreas costeras mexicanas.
Palabras clave: ostión; metales; bioconcentración; laguna de Mandinga
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Received: October 2004; Accepted: January 2005
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