Universidade de São Paulo, Departamento de Hidráulica e Saneamento, Escola de Engenharia de São Carlos (EESC), Av. Trabalhador Sãocarlense, 400, 13566-590 São Carlos, SP, Brazil.
Universidade de Araraquara, Programa de Pós-Graduação em Desenvolvimento Territorial e Meio Ambiente, Rua Carlos Gomes, 1338, Centro, 14801-340 Araraquara, SP, Brazil.
An Acad Bras Cienc. 2021 Sep 20;93(suppl 3):e20200860. doi: 10.1590/0001-3765202120200860. eCollection 2021.
The use of agrochemicals in agriculture may impact aquatic ecosystems, particularly influencing the stream insect communities. Among aquatic insects, the family Chironomidae is the most abundant and species-diverse insect group found in freshwater ecosystems. However, in the southern hemisphere, studies with Chironomidae are still sparse, compared to Europe and North America. The present study evaluates the responses of Chironomidae species (Insecta: Diptera) to pyrimethanil fungicide in a mesocosm experiment. Water contamination and chironomid community were monitored over 10 months. After five months of monitoring, the pyrimethanil fungicide was completely degraded and there was a statistically significant increase in the Margalef Richness and Shannon-Wiener Index (H') in the control units when compared with the contaminated mesocosms (p = 0.003). Our results point out that the utilization of agrochemicals can be a harmful factor influencing negatively the Chironomidae populations. This finding has key implications for insect conservation strategies and ecological management environments.
农业中农用化学品的使用可能会对水生生态系统产生影响，特别是会影响溪流昆虫群落。在水生昆虫中，摇蚊科是淡水生态系统中最丰富和物种最多样化的昆虫类群。然而，与欧洲和北美相比，在南半球，有关摇蚊科的研究仍然很少。本研究在中观实验中评估了吡嘧菌胺杀菌剂对摇蚊科物种（昆虫纲：双翅目）的影响。在 10 个月的时间里监测了水的污染和摇蚊群落。监测五个月后，吡嘧菌胺杀菌剂完全降解，与受污染的中观模型相比，对照单元的 Margalef 丰富度和 Shannon-Wiener 指数（H'）有统计学意义上的显著增加（p = 0.003）。我们的结果指出，农用化学品的使用可能是一个有害因素，对摇蚊种群产生负面影响。这一发现对昆虫保护策略和生态管理环境具有关键意义。
