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 extrapolation
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.
| Main Authors: | , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | 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, PISCES, POECILIIDAE, |
| Online Access: | http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2012Casares |
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| Summary: | 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. |
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