Otro
Ecotoxicologia do glifosato e surfactante aterbane® br para guaru (Phalloceros caudimaculatus)
Registro en:
Acta Scientiarum - Biological Sciences, v. 32, n. 3, p. 285-289, 2010.
1679-9283
1807-863X
10.4025/actascibiolsci.v32i3.6795
2-s2.0-77957792637.pdf
2-s2.0-77957792637
Autor
Shiogiri, Natália Sayuri
Carraschi, Silvia Patrícia
Cubo, Patrícia
Schiavetti, Bárbara Lopes
da Cruz, Claudinei
Pitelli, Robinson Antonio
Resumen
Aquatic macrophytes are important components of aquatic ecosystems, but these plants have become a problem due to their occurrence in different regions. Some studies aimed to demonstrate the effectiveness of herbicides to control these macrophytes; however, few studies report the possible ecotoxicological effects. The objective of this study was to estimate the acute toxicity (LC (I)50;96h) and assess water quality variables for glyphosate in the Rodeo® formulation, Aterbane® BR surfactant and mixtures of glyphosate + 0.5% and 1.0% of surfactant, for the guaru fish (Phallocerus caudimaculatus). The guaru was exposed to increasing concentrations of glyphosate and a mixture of glyphosate + 0.5 and 1.0% of surfactant. The mixture of glyphosate and glyphosate + 0.5 and 1.0% of surfactant showed (LC (I)50;96h) > 975.0 mg L -1. For the surfactant, the rate was 5.81 mg L -1. The glyphosate and mixtures of glyphosate + 0.5% and 1.0% of surfactant caused a decrease in pH and dissolved oxygen and increased the electrical conductivity of water. Glyphosate in the Rodeo® formulation and the mixtures with surfactant Aterbane® BR can be classified as practically nontoxic, whereas surfactant Aterbane® BR can be considered as moderately toxic to guaru.