A synopsis of ‘hydropeaking’ studies on the response of juvenile Atlantic salmon to experimental flow alteration

摘要: In insular Newfoundland, Canada, studies were conducted from 1999 to 2003 on the effects of ‘simulated’ hydropeaking power generation juvenile Atlantic salmon (Salmo salar). 1999, parr released into an experimental reach below a hydroelectric facility and flow was manipulated over range discharge (1.0–4.2 m3 s−1) during series ‘experiments’ simulating in both summer fall. Fish implanted with radio transmitters, manually tracked, precisely located (±1 m), habitat selection evaluated, movement response determined. Experiments continued 2002 contrast between winter, magnitude changes greater (0.7–5.2 m3 s−1) made more rapidly (instantly). As increased, velocity depth use by fish adapted behaviourally increased contact substrate. Salmon also exhibited two distinct patterns fall studies; high site fidelity or considerable trials. mobile static dynamic conditions throughout diel cycle experiment, 2 stranded died, only time this happened four experiments. Within each experiment generally there no differences movements at low flows for day night movements, one exception, always greatest, again exception. During changes, within distances moved down ramping up not significantly different except 1999. Overall, comparing experiments events, statistically higher than all other Not surprisingly, home ranges greatest while smallest winter 2003. Results suggest regimes may be energetically costly potentially affecting over-winter survival which is related energy reserves obtained summer. Collectively these provide comprehensive information hydropeaking, seasonal scales, will assist hydro producers regulators design operate minimize ecological impact.