Hydropower-related pulsed-flow impacts on stream fishes: a brief review, conceptual model, knowledge gaps, and research needs

摘要: The societal benefits of hydropower systems (e.g., relatively clean electrical power, water supply, flood control, and recreation) come with a cost to native stream fishes. We reviewed synthesized the literature on hydropower-related pulsed flows guide resource managers in addressing significant impacts while avoiding unnecessary curtailment operations. Dams may release response needs for peaking recreational flows, reservoir storage adjustment or mimic natural peaks hydrograph. Depending timing, frequency, duration, magnitude, can have adverse beneficial short long-term effects resident migratory Adverse include direct fish populations due (1) stranding fishes along changing channel margins, (2) downstream displacement fishes, (3) reduced spawning rearing success redd/nest dewatering untimely obstructed migration. Beneficial include: maintenance habitat rearing, biological cues trigger spawning, hatching, developed basic conceptual model predict different types flow, identified gaps knowledge, research activities address these gaps. There is clear need quantitative framework incorporating mathematical representations field laboratory results temperature, structure, life stages by season, population dynamics, multiple species, which be used outcomes design mitigation strategies other regulated streams experiencing flows.