Effects of a Thiamethoxam-Based Insecticide on the Life History of Chironomus xanthus
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Thiamethoxam (TMX) is one of the most widely used neonicotinoid insecticides for pest control in agricultural crops. However, information on its acute and chronic toxicity for freshwater non-target insects is still limited. We aimed to evaluate the lethal and sub-lethal effects of TMX-based insecticide on Chironomus xanthus using laboratory ecotoxicological assays. Besides survival, 28-day partial life-cycle tests assessed the effects of chronic exposures on larval growth and emergence of midges. The estimated 48-h LC50 was 32 μg a. i./L of TMX. Chronic tests revealed that chironomids exposed to sub-lethal concentrations of TMX showed reduced larval growth (LOEC = 0.4 and 1.6 μg a.i/L of TMX for head capsule width and growth rate, respectively) and emergence rate (LOEC of 1.6 μg a.i/L of TMX). This study provides important ecotoxicological data concerning effects of TMX-based insecticides on tropical ecosystems and reveals that environmentally relevant concentrations of TMX can adversely affect chironomids populations. Our study also validates C. xanthus as a sensitive species to monitor the ecological integrity of tropical aquatic systems near intensive agricultural areas and to help understand the effects caused by TMX on freshwater insects.
KeywordsNeonicotinoids Freshwater insects Chironomids Sub-lethal toxicity
This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-CAPES, Brazil (Edital 71/2013—Programa Ciência Sem Fronteiras—Modalidade Pesquisador Visitante Especial-PVE—Projeto: A058_2013). We also thank to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil) and the Universidade Federal do Tocantins for the financial support. Althiéris S. Saraiva acknowledges the Instituto Federal de Educação, Ciência e Tecnologia Goiano—Campus Campos Belos for the support and partnership. Renato A. Sarmento received scholarship from Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq, Brazil (Projets: 304178/2015-2; 200895/2015-0). João Pestana acknowledges the Portuguese Foundation for Science and Technology (FCT) for the research contracts under the program “Investigador FCT” (IF/01420/2015).
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