Caracterización toxicológica en renacuajos de la rana (gastrotheca riobambae) en función de las concentraciones de n- fosfonometilglicina

Abstract

N-phosphonomethylglycine (glyphosate) is a herbicide widely used in agriculture for the control of weeds, but its continuous and excessive use has generated problems of toxicity in aquatic - terrestrial ecosystems due to its chemical stability, such as biodegradation and biocumulation in the food chain. In the case of amphibians they play a very fundamental role since they are the group of vertebrates considered excellent environmental indicators for having a life cycle, aquatic -terrestrial, in addition to developing an important role in the ecosystem as a predator or prey to help maintain the balance of nature. The present study consisted in characterizing agricultural activity soils of the La Esperanza parish and analyzing the presence of N-phosphonomethylglycine by HPLC techniques, obtaining results of 0.1mg.kg-1 in soil removed for maize sowing, 0.0 mg .kg-1 in maize crop soil in harvest and 0.4mg.kg-1 in barley culture soil, in addition to evaluate the lethal dose in tadpoles of the Andean marsupial frog Gastrotheca riobambae with the purpose of publicizing its importance as a bioindicator. The toxicological test reflects different behaviors in tadpoles of the Gastrotheca riobambae such as aggressiveness, inactivity period and finally death, the LD50 was 7487.26mg.l-1 and the DL100 was 9791.44mg.l-1 with a total mortality of the population