A toolkit for optimizing fish passage barrier mitigation actions

The presence of dams, stream–road crossings and other infrastructure often compromises the connectivity of rivers, leading to reduced fish abundance and diversity. The assessment and mitigation of river barriers is critical to the success of restoration efforts aimed at restoring river integrity. In this study, we present a combined modelling approach involving statistical regression methods and mixed integer linear programming to maximize resident fish species richness within a catchment through targeted barrier mitigation. Compared to existing approaches, our proposed method provides enhanced biological realism while avoiding the use of complex and computationally intensive population/ecosystem models. To estimate barrier passability quickly and at low cost, we further outline a rapid barrier assessment methodology. The methodology is used to characterize potential passage barriers for various fish species common to the UK but can be readily adapted to different planning areas and o...水坝、跨溪道路构筑物（stream–road crossings）及其他基础设施的存在，往往会削弱河流连通性，导致鱼类丰度与多样性下降。对河流障碍开展评估与缓减，是恢复河流完整性修复工程取得成功的关键所在。 本研究提出一种结合统计回归方法与混合整数线性规划（Mixed Integer Linear Programming）的联合建模方案，通过针对性的河流障碍缓减措施，实现流域（catchment）内定居鱼类物种丰富度的最大化。相较于现有研究方法，本研究提出的方案在提升生物学真实性的同时，规避了复杂且计算密集型的种群/生态系统模型的使用。 为实现快速且低成本的障碍通行性（barrier passability）评估，本研究进一步提出一套快速障碍评估方法。该方法可针对英国本土常见鱼类的潜在通行障碍进行特征表征，且可轻松适配至不同规划区域，o...