Defining environmental river types is an essential step in the development of accurate fish‐based methods (IBI, Index of Biotic Integrity) to assess the environmental quality of aquatic ecosystems. In this study, the environmental typology of the rivers and streams in the region of Chapada Diamantina was developed. Thirty‐five sampling sites representative of the upper Paraguaçu River and its main tributaries were characterized to characterize the fish assemblages and abiotic environmental descriptors. A cluster analysis based on fish species CPUE was performed to define a first biological typology. Then, a discriminant analysis model was developed to select the environmental descriptors that explained the fish‐based river types. The model selected 11 environmental variables and classified 91% of the cases. The river typology defined in this study will be used for the development of an IBI to assess the ecological status of the Chapada Diamantina rivers. It is expected that both the typology developed here and the future IBI will provide important and useful tools to develop and apply nature conservation‐oriented management schemes in the Chapada Diamantina aquatic ecosystems.

中文翻译：

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巴西半干旱河流的环境类型学，是应用生物完整性指数的第一步：Chapada Diamantina案

定义环境河流类型是开发精确的以鱼类为基础的方法（IBI，生物完整性指数）以评估水生生态系统环境质量的重要步骤。在这项研究中，开发了Chapada Diamantina地区的河流和河流的环境类型。代表巴拉圭河上游及其主要支流的35个采样点的特征是描述了鱼类的组成和非生物环境特征。进行了基于鱼类CPUE的聚类分析，以定义第一种生物学类型。然后，建立了判别分析模型以选择可解释以鱼类为基础的河流类型的环境描述子。该模型选择了11个环境变量，并对91％的案例进行了分类。本研究中定义的河流类型将用于IBI的开发，以评估Chapada Diamantina河流的生态状况。可以预期，这里开发的类型学和未来的IBI都将提供重要和有用的工具，以在Chapada Diamantina水生生态系统中开发和应用面向自然保护的管理计划。