Measured copper toxicity to Cnesterodon decemmaculatus (Pisces : Poeciliidae) and predicted by biotic ligand model in pilcomayo river wate : a step for a cross-fish-species extrapo...

• Autores: Casares, María Victoria; Cabo, Laura de; Seoane, Rafael; Natale, Oscar E.; Castro Ríos, Milagros; Weigandt, Cristian Fernando; Fabrizio de Iorio, Alicia Rosa
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Journal of Toxicology; Vol.2012; http://www.hindawi.com/
• Materia: CALCIUM; CHLORIDE; COPPER; MAGNESIUM; RIVER WATER; SODIUM; SULFATE; ANALYSIS OF VARIANCE; BIOTIC LIGAND MODEL; CONTROLLED STUDY; FISH; LC 50; NONHUMAN; PIMEPHALES PROMELAS; RIVER; SUSPENDED PARTICULATE MATTER; TOXICITY TESTING; WATER QUALITY; CNESTERODON DECEMMACULATUS; PIMEPHALES PROMELAS; PISCES; POECILIIDAE
• Institución: Universidad de Buenos Aires. Facultad de Agronomía

Fil: Weigandt, Cristian Fernando. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
Fil: Fabrizio de Iorio, Alicia Rosa. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
In order to determine copper toxicity (LC50) to a local species (Cnesterodon decemmaculatus) in the South American Pilcomayo River water and evaluate a cross-fish-species extrapolation of Biotic Ligand Model, a 96h acute copper toxicity test was performed. The dissolved copper concentrations tested were 0.05, 0.19, 0.39, 0.61, 0.73, 1.01, and 1.42mg Cu L -1. The 96h Cu LC50 calculated was 0.655mg L -1 (0.823-0.488). 96-h Cu LC50 predicted by BLM for Pimephales promelas was 0.722mg L -1. Analysis of the inter-seasonal variation of the main water quality parameters indicates that a higher protective effect of calcium, magnesium, sodium, sulphate, and chloride is expected during the dry season. The very high load of total suspended solids in this river might be a key factor in determining copper distribution between solid and solution phases. A cross-fish-species extrapolation of copper BLM is valid within the water quality parameters and experimental conditions of this toxicity test.