Low malathion concentrations influence metabolism in Chironomus sancticaroli (Diptera, Chironomidae) in acute and chronic toxicity tests

Revista Brasileira de Entomologia

Débora Rebechi²  Vinicius S. Richardi²  Maiara Vicentini²  Izonete C. Guiloski¹  Helena C. Silva De Assis¹  Mário A. Navarro-silva² 

[1] ,Universidade Federal do Paraná Departamento de Zoologia Laboratório de Entomologia Médica e VeterináriaCuritiba PR ,Brazil

关键词: Acetylcholinesterase;    bioindicator;    esterases;    organophosphate;    toxicity;   

DOI  :  10.1590/S0085-56262014000300012

来源: SciELO

【 摘 要 】

Low malathion concentrations influence metabolism in Chironomus sancticaroli (Diptera, Chironomidae) in acute and chronic toxicity tests. Organophosphate compounds are used in agro-systems, and in programs to control pathogen vectors. Because they are continuously applied, organophosphates often reach water sources and may have an impact on aquatic life. The effects of acute and chronic exposure to the organophosphate insecticide malathion on the midge Chironomus sancticaroli are evaluated. To that end, three biochemical biomarkers, acetylcholinesterase (AChE), alpha (EST-α) and beta (EST-β) esterase were used. Acute bioassays with five concentrations of malathion, and chronic bioassays with two concentrations of malathion were carried out. In the acute exposure test, AChE, EST-α and EST-β activities declined by 66, 40 and 37%, respectively, at 0.251 µg L-1 and more than 80% at 1.37, 1.96 and 2.51 µg L-1. In chronic exposure tests, AChE and EST-α activities declined by 28 and 15% at 0.251 µg L-1. Results of the present study show that low concentrations of malathion can influence larval metabolism, indicating high toxicity for Chironomus sancticaroli and environmental risk associated with the use of organophosphates.

【 授权许可】

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