Oxygen consumption and ammonia excretion of the freshwater crab Trichodactylus borellianus exposed to chlorpyrifos and endosulfan insecticides.

MONTAGNA M.; COLLINS P.

PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Holanda; Año: 2008 vol. 92 p. 150 - 155

0048-3575

The effects of lethal and sublethal concentrations of chlorpyrifos and endosulfan on oxygen consumption and ammonia excretion rate of the crab Trichodactylus borellianus were evaluated. Oxygen consumption and energy expenditure had significant effect in relation to exposure times. Regarding endosulfan, a significant difference in consumption among times of exposure was registered in 625 lg L1. Moreover, at the highest concentration, energy expenditure rate was observed stabilized during 1–3 h. A significant increase in ammonia excretion was evidenced in 150 and 300 lg L1 of chlorpyrifos. The O:N ratio showed a decrease in chlorpyrifos and in 2500 lg L1 of endosulfan. This indicated a shift towards protein primary metabolism. An increment in the O:N ratio was observed in the lower endosulfan solutions. The relation oxygen:nitrogen showed a shift towards lipid and carbohydrate primary metabolism. This work indicated the complexity of the metabolism in the freshwater crab affected by xenobiotic elements.