Mining is an important human activity, but it strongly alters terrestrial and aquatic landscapes. Understanding the response of community-level descriptors is essential to plan monitoring and management strategies. In this context, we investigated differences in the environmental conditions and ichthyofauna (taxonomic and functional) structure in five pristine and four disturbed streams in a Central Amazon protected area sampled in the dry season of 2012. Additionally, we analyzed if taxonomic and functional structure exhibited similar spatial variation patterns among streams. Pristine streams exhibited higher richness and proportion of catfishes (Siluriformes) than disturbed streams, but no differences in the functional structure. The taxonomic and functional structure of the fish assemblages in the Saracá-Taquera National Forest varied concomitantly among the streams. Our results indicate that taxonomic-based metrics were more sensitive to the mining impacts in the Saracá-Taquera National Forest, probably because of the high functional redundancy of the local assemblages. We highlight the sensitivity of richness and proportion of siluriformes for monitoring stream fish assemblages in the Central Amazon.

采矿是一项重要的人类活动，但它极大地改变了陆地和水生景观。了解社区级别描述符的响应对于规划监控和管理策略至关重要。在此背景下，我们调查了在 2012 年旱季采样的亚马逊中部保护区的 5 条原始河流和 4 条受干扰河流中的环境条件和鱼类（分类和功能）结构的差异。此外，我们分析了分类和功能结构是否表现出流之间相似的空间变化模式。原始溪流比受干扰的溪流表现出更高的鲶鱼（鲶形目）的丰富度和比例，但功能结构没有差异。Saracá-Taquera 国家森林中鱼类群落的分类和功能结构在溪流之间也随之变化。我们的结果表明，基于分类的指标对 Saracá-Taquera 国家森林的采矿影响更为敏感，这可能是因为当地组合的功能冗余度很高。我们强调了鲶形目丰富度和比例对于监测亚马逊中部河流鱼类组合的敏感性。