EFFECT OF PESTICEDE ON METAMORPHOSIS OF FROG TADPOLE, EUPHLYCTIS CYNOPHLYCTISV.I. KALAMADE
Decline in the amphibian population has been noted since 1980s from all over the world. Thirty two percent of species are globally threatened nine to twelve species have become extinct since 1980s. This decline is perceived as one of the most critical threats to global biodiversity andenvironmental imbalance. Several causes are believed to be involved, including diseases, habitat destruction and modification, exploitation, pollution, pesticide use, climate change and increased UV radiation. However many of the causes of amphibian decline are still poorly understood. Contamination of environmental factors by pollutants have resulted in alarming decline in Amphibian population, this fact has highlighted the importance of using Amphibians as a bioindicators of environmental pollution and biological signal of toxicity. Most of the Amphibian species breed in rice field, but the pesticide Hamla (Trade name), which is the mixture of Chlorpyrifos and cypermethane, is sprayed to eradicate insect pest on rice. This may contaminate the breeding water to the harmful level. The present work had been carried out to study effect of the pesticide Hamla on metamorphosis of tadpole of Frog (Euphlyctis cynophlyctis) and on histological structure of intestine of tadpole treated with sub lethal levels of Hamla. Our results showed that sub lethal concentrations of Hamla arrested metamorphosis of tadpole and damaged the histological structure of intestine. It appears Hamla is one of the chemical agents responsible for alarming decline in Amphibian population.
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