INVESTIGADORES
COLLINS Pablo Agustin
congresos y reuniones científicas
Título:
Crecimiento del camarón Palaemonetes argentinus (Decapoda; Caridea) expuesto a insecticidas con clorpirifos y endosulfán como elemento activo
Autor/es:
MONTAGNA M.; COLLINS P.
Lugar:
Córdoba
Reunión:
Congreso; XXII Reunión Argentina de Ecología,; 2006
Institución organizadora:
Asociación Argentina de Ecología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Instituto Multidisciplinario de Biología Vegetal, Centro de Investigaciones Entomológicas de Córdoba y Proyecto Lampalagua
Resumen:
Resumen: Pesticides, such as chlorpyrifos and endosulfan, are used in agricultural systems to control a broad spectrum of animal pests. In the present study, the acute toxicity, and individual growth of the freshwater prawn Palaemonetes argentinus in relation to chlorpyrifos Terminator Ciagro® and endosulfan Zebra Ciagro® exposure were investigated by means of a bioassay in the laboratory. To individual growth, the prawns were exposed to different insecticides sublethal concentrations: 0.005, 0.011 and 0.022 µg.L-1 of chlorpyrifos, and 0.122, 0.244 and 0.488 µg.L-1 of endosulfan. Every day, animals were checked for molting and mortality. The prawns of control, the cephalothorax length (CL) increase linearity per molt. In chlorpyrifos, the means CL increase linearity during the trial time. Only at the highest concentrations, a decreased in length was showed. In endosulfan, a reduction in CL was observed, at least when comparing first and last molt in all cases. In control, intermolt period was directly proportional to increase in size. In the other group, the intermolt period was influenced by toxic effect of pesticides in each successive instar. Direct comparison between the means growth rate of pesticide solutions and control show same pattern until the second molt, then the effect of toxic exposition in rearing time was stronger. These variations showed that the physiological alteration of normal pattern by toxic exposition. The results suggest that juveniles of Palaemonetes argentinus are sensitive to chlorpyrifos and endosulfal pollution.