期刊名称：Revista Ibero-Americana de Ciências Ambientais
电子版ISSN：2179-6858
出版年度：2020
卷号：11
期号：4
页码：113-125
DOI：10.6008/CBPC2179-6858.2020.004.0010
出版社：Escola Superior de Sustentabilidade
摘要：Chironomid larvae are widely distributed, with high diversity and abundance, and exploit a range of habitats and food resources. They are also an important food resource for various groups of aquatic organisms. Therefore, this study aimed to evaluate the spatial and seasonal variations in the composition of diet and genera of Chironomidae larvae in two streams located in south central west region of Brazil, associated with the environmental impact assessment, based on visual, physical and chemical indicators of streams. The contents of the digestive tracts of the most abundant genera were observed and classified into fine detritus, coarse detritus, algae, fungi, or animal material. Dissolved oxygen, conductivity, and incident light, along with the dominance of certain genera, were strong indicators of pollution in the impacted stream. Cluster analysis indicated three trophic groups: 1) generalist detritivores, consuming fine particulate organic matter and making up 82 % of the genera analyzed; 2) predators, which consumed mainly animal material; and 3) specialist shredding detritivores, present only in the less-impacted stream. These results are useful in understanding anthropogenic effects on stream ecosystems.
关键词：Bioindicadores; Macroinvertebrados; Grupos Tróficos; Riachos Tropicais; Recursos Alimentares
