Adequate environmental management in tropical aquatic ecosystems is imperative. Given the lack of knowledge about functional diversity and bioassessment programs, management is missing the needed evidence on pollution and its effect on biodiversity and functional ecology. Therefore, we investigated the composition and distribution of the macroinvertebrate community along two rivers. Specifically, 15 locations were sampled in the Coca and Aguarico Rivers (Ecuadorian Amazon) and the macroinvertebrates were used to indicate water quality (WQ), expressed as the Biological Monitoring Working Party Colombia (BMWP-Col) classes. Results indicate that elevation, pH, temperature, width, and water depth played an important role in the taxa and functional feeding groups (FFG) composition. The results show that diversity of taxa and FFG were generally scarce but were more abundant in good quality sites. Collector-gathers (CG) were, in general, dominant and were particularly abundant at low WQ and downstream sites. Scrapers (SC) were the second most abundant group, dominating mostly at good WQ and upstream sites. Predators (PR) were homogeneously distributed among the sites, without clear dominance, and their abundance was slightly higher in sites with medium-low WQ and downstream sites. Lastly, both shredders (SH) and collector-filterers (CF) were almost absent and were more abundant in good quality sites. The findings of this research can be used as baseline information in the studied region since a dam was constructed two years after the sampling campaign, which has been operating since. Furthermore, the results can be used to fill the knowledge gaps related to the bioassessments of other similar systems, particularly for a tropical rainforest.

中文翻译：

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厄瓜多尔亚马逊地区 Aguarico 和 Coca 河流域底栖大型无脊椎动物群落和生物质量的变化

对热带水生生态系统进行充分的环境管理势在必行。鉴于缺乏有关功能多样性和生物评估计划的知识，管理部门缺少有关污染及其对生物多样性和功能生态影响的必要证据。因此，我们调查了沿两条河流的大型无脊椎动物群落的组成和分布。具体而言，在古柯河和阿瓜里科河（厄瓜多尔亚马逊河）中的 15 个地点采样，大型无脊椎动物用于指示水质 (WQ)，表示为哥伦比亚生物监测工作组 (BMWP-Col) 类别。结果表明海拔、pH 值、温度、宽度和水深在分类群和功能性摄食群 (FFG) 组成中起着重要作用。结果表明，类群和 FFG 的多样性普遍稀少，但在优质站点中更为丰富。收集器（CG）通常占主导地位，并且在低 WQ 和下游站点特别丰富。刮板 (SC) 是第二丰富的组，主要在良好的 WQ 和上游站点占主导地位。捕食者（PR）在站点之间均匀分布，没有明显的优势，在中低WQ站点和下游站点中它们的丰度略高。最后，粉碎机 (SH) 和收集过滤器 (CF) 几乎都不存在，并且在优质站点中更为丰富。这项研究的结果可用作研究区域的基线信息，因为在采样活动两年后建造了一座大坝，此后一直在运行。此外，