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

Authors

  • Elsa María Arrázola-Vásquez Laboratorio de Ingeniería Ambiental. Carrera de Ingeniería Ambiental. Universidad Científica del Sur (UCSUR), Lima, Perú. https://orcid.org/0000-0001-7293-3422
  • José Iannacone Laboratorio de Ingeniería Ambiental. Carrera de Ingeniería Ambiental. Universidad Científica del Sur (UCSUR), Lima, Perú.Grupo de Investigación en Sostenibilidad Ambiental (GISA), Escuela Universitaria de Posgrado (EUPG), Laboratorio de Ecología y Biodiversidad Animal (LEBA). Facultad de Ciencias Naturales y Matemática (FCCNM). Universidad Nacional Federico Villarreal (UNFV), Lima, Perú.Laboratorio de Parasitología. Facultad de Ciencias Biológicas. Universidad Ricardo Palma. Lima, Perú. https://orcid.org/0000-0003-3699-4732

DOI:

https://doi.org/10.24039/rtb2021191898

Keywords:

ecotoxicity, Eisenia fetida, insecticides, pesticides, Toxic units

Abstract

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.

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Published

2021-02-02

How to Cite

Arrázola-Vásquez, E. M., & Iannacone, J. (2021). EVALUATION OF THE ENVIRONMENTAL RISK OF THE MIX OF ALPHA-CYPERMETHRIN AND IMIDACLOPRID ON THE EARTHWORM (EISENIA FETIDA) (SAVIGNY, 1826). The Biologist, 19(1), 111–124. https://doi.org/10.24039/rtb2021191898

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Original Articles