Deltamethrin-induced deregulation of the water balance in the migratory locust,Locusta migratoria |
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| Affiliation: | 1. Center for Nutrition, Healthy Lifestyles & Disease Prevention, School of Public Health, Loma Linda University, United States;2. Department of Epidemiology, UCLA, United States;3. Department of Environmental Health Sciences, UCLA, United States;4. Department of Neurology, UCLA, United States;5. Department of Human Genetics, UCLA, United States;6. Department of Biomathematics, UCLA, United States;7. Department of Biostatistics, UCLA, United States;8. Department of Preventive Medicine, University of Southern California, United States |
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| Abstract: | 1. Several insecticides were tested for their ability to induce a water deregulation in the larval migratory locust. All of them provoked an accelerated dehydration (when compared to sham-operated insects). Deltamethrin and baygon were the most potent.2. This enhanced dehydration due to deltamethrin in adult locust resulted from an increase in the water loss through the feces. This increase was not due to a direct effect of deltamethrin on urine production by the Malpighian tubules but to a hormonal deregulation.3. Intoxicated insects produced large amounts of the vasopressin-like insect diuretic hormone. This higher synthesis activity occurs within the hours following the insecticide injection and is accompanied by an increase in water loss.4. These hormonal and metabolic modifications are transient. Hormonal level and diuresis rate both return to the basal levels 7 hr after the insecticide injection. |
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