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

Revista Brasileira de Entomologia. 2014;58(3):296-301 DOI 10.1590/S0085-56262014000300012

 

Journal Homepage

Journal Title: Revista Brasileira de Entomologia

ISSN: 0085-5626 (Print); 1806-9665 (Online)

Publisher: Elsevier

Society/Institution: Sociedade Brasileira de Entomologia

LCC Subject Category: Science: Zoology

Country of publisher: Netherlands

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS

Débora Rebechi (Universidade Federal do Paraná)
Vinicius S. Richardi (Universidade Federal do Paraná)
Maiara Vicentini (Universidade Federal do Paraná)
Izonete C. Guiloski (Universidade Federal do Paraná)
Helena C. Silva de Assis (Universidade Federal do Paraná)
Mário A. Navarro-Silva (Universidade Federal do Paraná)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 16 weeks

 

Abstract | Full Text

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.