Hydropeaking effects on movement patterns of brown trout (Salmo trutta L.)
Hydropeaking effects on movement patterns of brown trout (Salmo trutta L.)
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水峰对褐鳟 (Salmo trutta L.) 运动模式的影响
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
C. Alcaraz
中科院分区：
文献类型：
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作者：
Rafel Rocaspana;E. Aparicio;Antoni Palau;R. Guillem;C. Alcaraz
采用无线电遥测技术研究了不同流量调节方案下Noguera Pallaresa河（埃布罗盆地，西班牙东北部）两个河段中褐鳟鱼萨尔莫特鲁塔（尺寸范围188-420 mm叉长，N = 30）的季节性运动和家域。NP-1河段是一个接近自然水流条件的旁路段，而下游河段NP-2每天都有脉冲流量排放（即，水力调峰）。研究河段之间的家域大小（95%核估计值）和季节运动模式存在显著差异，绕过河段NP-1的平均家域大小为（μ ± SE）112.1 ± 11.5 m，在水峰河段NP-2显著增加至237.9 ± 37.2 m。有一个很大的个体变异范围内的鱼的家域大小。大部分的鱼类运动的季节性差异之间的河段与产卵季节。夏季白天NP-2的脉冲放电事件（持续约3小时，水流量从1 m3/s增加到20 m3/s）在事件持续期间没有引起上游或下游方向的显著位移。我们的研究结果突出了栖息地的连接性的重要性，由于需要褐鳟鱼之间的互补栖息地，完成其生命周期所必需的移动距离很大，与不受管制或更稳定的流。
Radiotelemetry was used to investigate seasonal movement and home range of brown trout Salmo trutta (size range 188–420 mm fork length, N = 30) in two reaches of the Noguera Pallaresa River (Ebro Basin, north‐east Spain) subjected to different flow regulation schemes. NP‐1 reach is a bypassed section with near natural flow conditions, whereas the downstream reach NP‐2 is subjected to daily pulsed flow discharge (i.e., hydropeaking) from an upstream hydropower station. Significant differences in home range size (95% kernel estimates) and seasonal movement pattern between study reaches were found. Mean home range size was (μ ± SE) 112.1 ± 11.5 m in the bypassed reach NP‐1 and increased significantly in the hydropeaking reach NP‐2 up to 237.9 ± 37.2 m. There was a large individual variability in fish home range size within reaches. Most of the seasonal differences in fish movement among reaches were associated with the spawning season. Pulsed discharge events in NP‐2 during daytime in summer (lasting about 3 hr and increasing water flow from 1 to 20 m3/s) did not cause significant displacements in either upstream or downstream direction during the duration of the event. Our results highlight the importance of habitat connectivity in hydropeaking streams due to the need of brown trout to move large distances among complementary habitats, necessary to complete their life cycle, compared with unregulated or more stable streams.