Programa de Pós-graduação em Biologia de Ambientes Aquáticos Continentais, Universidade Federal do Rio Grande, Av. Itália, Km 8 - Campus Carreiros, Rio Grande, Rio Grande do Sul, 96203-900, Brazil.
Programa de Pós-graduação em Ciências Ambientais, Área de Ciências Naturais e Exatas, Universidade Comunitária da Região de Chapecó, Avenida Senador Atílio Fontana, Chapecó, SC, 591E89809-000, Brazil.
Environ Monit Assess. 2021 Mar 24;193(4):215. doi: 10.1007/s10661-021-08997-0.
In regions with intense agricultural activity, increases in heavy metal concentrations in aquatic environments are common. Among the metals associated with agricultural activities, copper (Cu) and cadmium (Cd) have been found to directly affect aquatic trophic structures due to the ease of incorporation by primary producers and consuming organisms. Aquatic insects are predominantly found in streams, and their presence is determined by environmental characteristics and food availability. In this study, we seek to understand how the incorporation of Cu and Cd by scraper insects relates to their environment and food sources. We collected water, sediment, biofilm and scraper insect samples in streams with different intensities of agricultural activities in the drainage areas. The intensity of agricultural activities in the catchment area positively influenced the Cu and Cd concentrations in organisms and other aquatic compartments. The metals were readily incorporated by the biofilms. Although the functional characteristics are important to understand the functioning of ecosystems, in this study, we found that the physiological characteristics can be determinants in the concentrations of metals in aquatic insects.
在农业活动强烈的地区，水生环境中重金属浓度的增加是很常见的。在与农业活动相关的金属中，铜（Cu）和镉（Cd）由于易于被初级生产者和消耗生物吸收，被发现直接影响水生营养结构。水生昆虫主要存在于溪流中，它们的存在取决于环境特征和食物供应。在本研究中，我们试图了解刮食昆虫对 Cu 和 Cd 的吸收与它们的环境和食物来源有何关系。我们在不同农业活动强度的流域溪流中收集了水、沉积物、生物膜和刮食昆虫样本。集水区农业活动的强度对生物和其他水生生物中 Cu 和 Cd 浓度有正向影响。这些金属很容易被生物膜吸收。尽管功能特征对于理解生态系统的功能很重要，但在本研究中，我们发现生理特征可能是水生昆虫中金属浓度的决定因素。
