Acute and chronic effects of atrazine and sodium dodecyl sulfate on the tropical freshwater cladoceran Pseudosida ramosa.
Ecotoxicology
; 21(5): 1347-57, 2012 Jul.
Article
em En
| MEDLINE
| ID: mdl-22434152
Toxicities of atrazine and sodium dodecyl sulfate (SDS) to the tropical freshwater cladoceran Pseudosida ramosa were studied in the laboratory. Acute tests showed that the 48-h LC50 of atrazine was 20.9 mg l⻹, while that of SDS was 11.1 mg l⻹. P. ramosa showed to be slightly more sensitive than the other species of temperate cladocerans, in the assay conditions specified for each one. Long-term exposure of P. ramosa individuals to atrazine decreased the 21-day fecundity, the 21-day fertility and r(m), at concentrations ranging from 0.8 to 3.2 mg l⻹. Furthermore, fecundity and fertility at each brood decreased from the first to the fifth, at concentrations ranging from 0.8 to 3.2 mg l⻹ and for the first three broods at the concentration of 0.4 mg l⻹. Long-term exposure of female P. ramosa to SDS decreased the 21-day fecundity, the 21-day fertility and r(m), at concentrations of 2 and 4 mg l⻹. Fecundity and fertility of each brood were reduced from the first to the fifth, at concentrations of 2-4 mg l⻹, and for the first three at concentrations of 0.5 and 1 mg l⻹. The survival and moulting of the adult females were not affected by either chemical at the concentrations tested. Many water quality criteria in tropical regions are based on ecotoxicological tests with non-native species and this may lead to errors in setting the maximum permissible levels of chemicals in water bodies. Therefore, we reiterate here the idea of using native species in ecotoxicological assessments.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Atrazina
/
Dodecilsulfato de Sódio
/
Monitoramento Ambiental
/
Cladocera
Limite:
Animals
Idioma:
En
Revista:
Ecotoxicology
Assunto da revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos