出版社：Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências
摘要：Water resources are the most affected by agricultural activity in a region, compromising the characteristics of water systems. The expansion of the agricultural frontier and the use of fertilizers and pesticides, which has been occurring in the Cerrado Tocantinense, constitutes a major threat to the quality, conservation and biodiversity of this environment, thus requiring greater control to preserve water quality. With that in mind, this work evaluated the diversity of benthic macroinvertebrates and classified the ecological quality, using biological indices Hilsenhoff Family Biotic Index (IBF) and Biological Monitoring Working Party-score (BMWP) based on the presence and absence of aquatic organisms, to assess the environmental degradation and health of this ecosystem. It was found that the samples from the dry period showed a greater diversity of organisms collected, although they showed a lower relative abundance in relation to sensitive organisms that are indicators of ecological quality. According to the different biological indices used, the IBF index was the one that attributed the lowest quality to the water resource. This pollution was related to the sampled period, indicating a great pollution by organic substances in the study site. The macroinvertebrates used as indicators of bioassessment, classified the water of the Rio Formoso with the presence of pollution in the long term, thus showing an impact on the ecosystem.
