Toxicity Evaluation of Sediments From Santos Estuarine System Employing Sea-urchin Lytechinus variegatus (Echinoidea: Echinodermata)
DOI:
https://doi.org/10.5132/jbse.2007.03.005Palabras clave:
Baixada Santista, pore-water, sea-urchin, sediment, sediment-water interface, toxicity testsResumen
Toxicity tests using pore-water and sediment-water interface have been frequently used with the purpose of evaluating sediment quality, resulting in a better understanding of the biological effect of the pollutant dissolved phase associated to this compartment. Embryo-larval tests with sea-urchin are standardized and largely used to evaluate the short-term chronic toxicity in estuarine and marine sediments. This work evaluated the pore-water and the sediment-water interface toxicity, based on the sediment samples collected in seven different sites of the estuarine system of Santos, SP. Toxicity tests with sea-urchin embryo (Lytechinus variegatus) were used according to the procedure described in ABNT 15350/2006. The ammonia influence in pore-water toxicity was also evaluated. All the pore-water samples collected presented toxicity for Lytechinus variegatus, while the sediment-water interface tests did not show toxicity only in the station SSV1 (Ponta da Praia). The ammonia extraction led to a reduction in the samples toxicity, showing a strong influence of this substance in embryo-larval tests with pore-water. Results exhibited severe toxic effects in the internal area of the Santos estuary, where the port and industrial zones are situated.
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Derechos de autor 2007 Ecotoxicology and Environmental Contamination
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