Andean lakes are important for human well-being and biodiversity conservation, yet human-induced environmental changes threaten their biodiversity and the ecosystem services they provide. Knowledge of the relationship between biodiversity and environmental factors can provide insight into how human activity impacts lakes. We report trends of community composition of aquatic bird communities at six Andean lakes in Ecuador based on 15-years of monitoring. Additionally, we explore relationships among the abundance of aquatic bird species and environmental variables, such as elevation, water depth, biochemical demand of oxygen and concentration of phosphates and nitrites. We found a sustained population growth of one species of herbivorous bird, the Andean Coot, Fulica ardesiaca, across all lakes. Local trends in community composition show directional changes in four lakes and were likely a result of abundance increases of this species. Environmental factors related to eutrophication explained the abundance of F. ardesiaca, indicating that ongoing eutrophication of Andean Ecuadorian lakes, which results in increased submerged vegetation, benefits herbivorous species like this. Management measures that prevent further eutrophication combined with on-going monitoring should be considered in order to maintain ecosystem health and functioning.

安第斯湖泊对于人类福祉和生物多样性保护很重要，但是人为环境变化却威胁着其生物多样性及其提供的生态系统服务。了解生物多样性与环境因素之间的关系可以洞悉人类活动如何影响湖泊。根据对15年的监测，我们报告了厄瓜多尔的六个安第斯湖泊中水生鸟类群落的群落组成趋势。此外，我们探索了水生鸟类种类丰富与环境变量之间的关系，例如海拔，水深，氧气的生化需求以及磷酸盐和亚硝酸盐的浓度。我们发现，在所有湖泊中，一种食草鸟类（安第斯老傻瓜，山茱F）的种群持续增长。社区组成的局部趋势显示了四个湖泊的方向变化，这很可能是该物种大量增加的结果。与富营养化有关的环境因素解释了阿德斯藻的丰富程度，表明安第斯厄瓜多尔湖泊的持续富营养化导致淹没植被的增加，对这种食草物种有利。为了维持生态系统的健康和功能，应考虑采取防止进一步富营养化的管理措施并进行持续监测。