Responses in taxonomic and functional composition of communities were analysed in small Amazonian streams at the small and large scale (habitat patches, river segment scale, and catchment scale). We hypothesised that similar responses in community structure to local environmental factors were a correlation between taxonomic and functional composition. To evaluate the response of taxonomic composition to environmental variables, redundancy analysis (RDA) and RLQ analysis were performed to investigate the response of community abundance (L) as a function of the environment (R) and traits (Q). The fourth-corner analysis was applied to summarize specific interactions between environmental variables and traits. Then, community taxonomic composition was associated with models at multiple scales of habitat (i.e. riparian/channel, substrates, and water variables). Likewise, the fourth-corner tests and RLQ axes showed associations between trait composition and environmental variables related to variables, such as riparian cover and channel morphology followed by variation in substrate size and composition. Unexpectedly, these results did not show specific associations between unique environmental variables and traits. At last, results showed that local conditions of stream habitat regulated community structure and functional composition of aquatic insects. Thus, these findings indicate that the local environmental filtering appears to be strongly associated with selected species traits adapted to occur in a range of habitat conditions. Despite the low number of analysed streams, these results provide important information for understanding the simultaneous variation in functional trait composition and community composition of aquatic insect assemblages.

中文翻译：

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栖息地过滤如何影响小亚马逊河流域水生昆虫群落的分类和功能组成。

在小规模和大规模（栖息地，河段规模和集水规模）的亚马逊河中分析了社区的分类学和功能组成方面的响应。我们假设社区结构对当地环境因素的类似反应是分类学和功能组成之间的关联。为了评估生物分类组成对环境变量的响应，进行了冗余分析（RDA）和RLQ分析，以调查群落丰富度（L）与环境（R）和性状（Q）的关系。第四角分析用于总结环境变量和性状之间的特定相互作用。然后，将社区分类学组成与多种生境规模（例如河岸/渠道，底物，和水变量）。同样，第四角测试和RLQ轴显示了性状组成与与变量相关的环境变量之间的关联，例如河岸覆盖率和河道形态，其次是底物大小和组成的变化。出乎意料的是，这些结果并未显示出独特的环境变量和性状之间的特定关联。最后，研究结果表明，河流生境的当地条件调节着水生昆虫的群落结构和功能组成。因此，这些发现表明，局部环境过滤似乎与适应于在一系列生境条件下发生的选定物种性状密切相关。尽管分析的流数量很少，