Understanding how the movement and habitat use of fishes are influenced by flow regimes is important in sustainably managing river ecosystems, particularly in regions undergoing drying due to climate change. Here, we aimed to determine how the movement of a freshwater fish from refuge pools is influenced by discharge and environmental variables in south‐western Australia, a region that has suffered an ~50% reduction in surface flows since the 1970s. We quantified the movement patterns of the freshwater plotosid Tandanus bostocki using acoustic telemetry in two rivers that had different flow regimes and habitat characteristics. We hypothesized that its movements would be positively influenced by discharge and it would also display a high degree of site fidelity. Fifty fish were tagged and monitored across both rivers for a 1‐year period. There was an overall significant positive relationship between daily movements from the monitored refuge pools with both discharge and solar irradiation in both rivers. However, there was a greater probability of movement at a lower magnitude of discharge in the regulated Harvey River, which was attributed to the influence of river gradient and prevalence of instream barriers moderating the effect of flow on movements in the Brunswick River. The species demonstrated a considerable degree of site fidelity and also displayed homing behaviour. The study suggests that the maintenance of key refuge pools during baseflow, and ensuring river connectivity during the key movement periods, would help maintain the viability of the species as river discharge continues to decline due to climate change.

中文翻译：

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温带地区放水方式对淡水鱼迁移和避难所的影响

了解鱼类的运动和栖息地的使用方式如何受到水流状况的影响，对于可持续管理河流生态系统，尤其是在气候变化导致干旱的地区尤其重要。在这里，我们的目的是确定澳大利亚西南部（该地区自1970年代以来地表水流减少了约50％）的排放量和环境变量如何影响避难池中淡水鱼的移动。我们量化了淡水积水坦达纳斯·波斯托克的运动模式在两个具有不同流量状态和栖息地特征的河流中使用声遥测技术。我们假设它的运动会受到放电的积极影响，并且还会表现出高度的现场保真度。在两条河流上标记了50条鱼并进行了1年的监测。在两条河流中，受监控的避难池的日常活动与排放和太阳辐射之间总体上存在显着正相关。但是，经过调节的哈维河在较低的流量下有较大的运动可能性，这归因于河流坡度的影响和河道障碍的普遍存在，从而减缓了对不伦瑞克河运动的影响。该物种表现出相当程度的位点保真度，并且还表现出归巢行为。该研究表明，在基流期间维护关键的避难所池，并确保关键运动期间的河流连通性，将有助于维持该物种的生存能力，因为由于气候变化河流排放量继续下降。