Freshwater ecosystems are an essential resource for human use and natural populations, but they are exposed to different sources of man-made pollution. This study analyses how different environmental pollution processes influence the structure of bacterial communities in tropical rivers. A scoping review was performed to characterize the bacterial communities in freshwater ecosystems in tropical regions that have been reported to be associated with pollution of different kinds. The statistical analyses allowed us to categorize the genera found into three large groups (pollution generalists, middle types, and pollution specialists) according to the types of pollutants with which they were associated. The results show that Escherichia has a greater association with fecal contamination, while Enterococcus is more associated with domestic wastewater and organic and synthetic chemicals. The present study proposes Streptomyces as a potential indicator of waters with microbial contamination, as well as some other genera as possible indicators of waters with heavy metal contamination.

中文翻译：

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不同环境污染过程对热带河流细菌关键指标的影响：范围界定审查

淡水生态系统是人类利用和自然种群的重要资源，但它们面临着不同来源的人为污染。本研究分析了不同的环境污染过程如何影响热带河流细菌群落的结构。进行了范围界定审查，以描述热带地区淡水生态系统中的细菌群落特征，据报道，这些细菌群落与不同类型的污染有关。统计分析使我们能够根据与其相关的污染物类型将发现的属分为三大类（污染通才型、中等类型和污染专家）。结果表明，埃希氏菌与粪便污染的关联性更大，而肠球菌则与生活废水以及有机和合成化学品的关联性更大。本研究提出链霉菌作为微生物污染水体的潜在指示剂，以及其他一些属作为重金属污染水体的可能指示剂。