RESUMO
Chemical dispersants can be a beneficial method for breaking up oil slicks; however, their use in mitigation could pose potential toxic effects on the marine ecosystem. Dispersants may be transported to lower salinity habitats, where toxicity data for aquatic species have not been established. This study examined the effect of salinity on oil dispersant toxicity in the eastern mud snail, Ilyanassa obsoleta, using two dispersants authorized for oil spill response, Corexit® 9500A and Finasol® OSR 52. Median lethal toxicity values (LC50) and sublethal effects were examined at 10, 20, and 30 ppt salinity in adult and larval mud snails. Two biomarkers (lipid peroxidation and acetylcholinesterase) were used to measure sublethal effects. The 96-h static renewal LC50 values indicated significant differences in toxicity between dispersants and salinities. Larval snails were significantly more sensitive than adult snails to both dispersants, and both life stages were significantly more sensitive to Finasol than to Corexit. Larval snails were more sensitive to dispersants at lower salinity, but adult snails were more sensitive at higher salinities. Dispersants increased lipid peroxidation and decreased acetylcholinesterase activity. These results demonstrate that dispersant toxicity varies among compounds and organism life stages, and that physicochemical properties of the environment, such as salinity, can affect the potential toxicity to estuarine species.
Assuntos
Poluição por Petróleo/análise , Petróleo/análise , Caramujos/efeitos dos fármacos , Tensoativos/toxicidade , Poluentes Químicos da Água/toxicidade , Animais , Larva/efeitos dos fármacos , Dose Letal Mediana , Lipídeos/análise , Lipídeos/toxicidade , Compostos Orgânicos/análise , Compostos Orgânicos/toxicidade , Salinidade , Tensoativos/análise , Poluentes Químicos da Água/análiseRESUMO
The physical health of people with schizophrenia is poor, and the challenges in finding effective treatment and optimizing health outcomes are significant. However, it is likely that people diagnosed with schizophrenia can be partners in the treatment of their physical health problems. Research suggests that many people with schizophrenia value physical health and will participate in health-related behaviors when they are provided with the opportunity to do so.
