Anthropogenic impacts are altering ecosystems, especially aquatic habitats, resulting in the loss of critical biodiversity. This study aimed to evaluate the influence of human pressure, as surrogated by the human footprint index (HFI), on the functional diversity of fish assemblages from 109 Neotropical reservoirs while considering covariates such as temperature, flooded area and age since damming. We assessed two components of functional diversity (richness and dispersion) and the specific trait composition of each fish assemblage. We found that both components of fish functional diversity decreased with increasing human pressure and that this relationship was stronger in reservoirs near large cities. There was a positive relationship between functional diversity and reservoir area, and a negative relationship between functional diversity and reservoir age. We also observed strong relationships between all the explanatory variables and functional traits, particularly for the HFI. We can infer that the ichthyofaunas of those reservoirs under higher human pressure are likely undergoing a simplification process along with homogenization of functional diversity.

中文翻译：

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新热带水库鱼类组合的功能性侵蚀和性状丧失：环境以外的人

人为影响正在改变生态系统，特别是水生生境，导致关键生物多样性的丧失。这项研究旨在评估人类压力（受人类足迹指数（HFI）的影响）对109个新热带水库鱼群功能多样性的影响，同时考虑自筑坝以来的温度，洪水面积和年龄等协变量。我们评估了功能多样性的两个组成部分（丰富性和分散性）以及每种鱼类组合的特定性状组成。我们发现，鱼的功能多样性的两个组成部分都随着人为压力的增加而降低，并且这种关系在大城市附近的水库中更强。功能多样性与库区之间存在正相关关系，以及功能多样性与水库年龄之间的负相关关系。我们还观察到所有解释变量和功能性状之间的密切关系，特别是对于HFI。我们可以推断，在较高的人类压力下，这些水库的鱼腥金枪鱼可能会随着功能多样性的均质化而经历简化过程。