EVALUATION OF THE ENVIRONMENTAL RISK OF THE MIX OF ALPHA-CYPERMETHRIN AND IMIDACLOPRID ON THE EARTHWORM (EISENIA FETIDA) (SAVIGNY, 1826)

• Autores: Arrázola-Vásquez, Elsa María, Iannacone, José
• Formato: artículo
• Fecha de Publicación: 2021
• Institución: Universidad Nacional Federico Villarreal
• Repositorio: Revistas - Universidad Nacional Federico Villarreal
• Lenguaje: español
• OAI Identifier: oai:ojs2.revistas.unfv.edu.pe:article/898
• Enlace del recurso: https://revistas.unfv.edu.pe/rtb/article/view/898
• Nivel de acceso: acceso abierto
• Materia: ecotoxicity; Eisenia fetida; insecticides; pesticides; Toxic units; ecotoxicidad; insecticidas; plaguicidas; Unidades tóxicas

In the present study, the environmental risk (ERA) of alpha-cypermethrin and imidacloprid, individually and as a mixture, was evaluated on Eisenia fetida (Savigny, 1826). The mean lethal concentration (LC50) values for alpha-cypermethrin and imidacloprid individually were 341.1 mg·kg-1 and 2.34 mg·kg-1 at 14 d of exposure, respectively, being the most toxic imidacloprid. A reduction in dry and wet weight was observed in E. fetida, for both pesticides. The mixture did not show a significant dose-response relationship at LC50; However, the values of NOEC (concentration at which no effect is observed) and LOEC (lowest concentration at which effect is observed), corresponding to wet and dry weight, presented a significant relationship. The analysis of toxic units (TU) established an antagonistic behavior of both pesticides. The evasion test showed a relationship with the presence of the toxin in the mixture, however the same did not occur in the individual tests. In general, none of the chemical compounds is considered a highly toxic compound and they do not represent a significant risk at an acute level based on mortality for E. fetida, but sublethal effects could be presented in organisms due to growth impairment.