Salmonid Habitat and Population Capacity Estimates for Steelhead Trout and Chinook Salmon Upstream of Scott Dam in the Eel River, California

IF 0.5 4区 环境科学与生态学 Q4 ECOLOGY
Emily J. Cooper, A. O’Dowd, J. Graham, D. Mierau, W. Trush, Ross Taylor
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引用次数: 5

Abstract

Abstract Estimating salmonid habitat capacity upstream of a barrier can inform priorities for fisheries conservation. Scott Dam in California's Eel River is an impassable barrier for anadromous salmonids. With Federal dam relicensing underway, we demonstrated recolonization potential for upper Eel River salmonid populations by estimating the potential distribution (stream-km) and habitat capacity (numbers of parr and adults) for winter steelhead trout (Oncorhynchus mykiss) and fall Chinook salmon (O. tshawytscha) upstream of Scott Dam. Removal of Scott Dam would support salmonid recovery by increasing salmonid habitat stream-kms from 2 to 465 stream-km for steelhead trout and 920 to 1,071 stream-km for Chinook salmon in the upper mainstem Eel River population boundaries, whose downstream extents begin near Scott Dam and the confluence of South Fork Eel River, respectively. Upstream of Scott Dam, estimated steelhead trout habitat included up to 463 stream-kms for spawning and 291 stream-kms for summer rearing; estimated Chinook salmon habitat included up to 151 stream-kms for both spawning and rearing. The number of returning adult estimates based on historical count data (1938 to 1975) from the South Fork Eel River produced wide ranges for steelhead trout (3,241 to 26,391) and Chinook salmon (1,057 to 10,117). An approach that first estimated juvenile habitat capacity and then used subsequent life stage survival rates yielded 1,281 (CV 56%) steelhead trout and 4,593 (CV 34%) Chinook salmon returning adults. Variability in estimated fish numbers reflects application of densities and survival rates from other populations, assumptions about salmonid productivity in response to potential spawning habitat capacity, residency and outmigration of early life-stages, summertime water quality conditions, and inter-annual hydrograph, marine, and population variability.
加州鳗鱼河斯科特水坝上游钢头鳟鱼和支努克鲑鱼的栖息地和种群容量估算
摘要估计屏障上游的鲑鱼栖息地容量可以为渔业保护的优先事项提供信息。加利福尼亚州鳗鱼河的斯科特大坝是溯河产卵鲑鱼无法通行的屏障。随着联邦大坝的重新许可,我们通过估计斯科特大坝上游冬季钢头鳟(Oncorhynchus mykiss)和秋季奇努克鲑鱼(O.tshawytscha)的潜在分布(溪流公里)和栖息地容量(鹦鹉和成体数量),证明了鳗鱼河上游鲑鱼种群的重新定居潜力。斯科特大坝的拆除将有助于鲑鱼的恢复,将上游干流鳗鱼河种群边界的鲑鱼栖息地溪流公里数从钢头鳟的2公里增加到465公里,将奇努克鲑鱼的920公里增加到1071公里,下游河段分别从斯科特大坝和南叉鳗鱼河交汇处附近开始。斯科特大坝上游,估计钢头鳟栖息地包括463公里的产卵溪流和291公里的夏季饲养溪流;据估计,奇努克鲑鱼的栖息地包括长达151公里的溪流,用于产卵和饲养。根据历史计数数据(1938年至1975年),从南叉鳗鱼河返回的成年个体数量估计,钢头鳟(3241至26391)和奇努克鲑鱼(1057至10117)的数量范围很广。一种首先估计幼年栖息地容量,然后使用后续生命阶段存活率的方法产生了1281条(CV 56%)钢头鳟和4593条(CV 34%)支奴干鲑鱼返回成年。估计鱼类数量的可变性反映了其他种群的密度和存活率的应用、对鲑鱼生产力的假设,以应对潜在的产卵栖息地容量、早期生活阶段的居住和外移、夏季水质条件以及年际水文、海洋和种群的可变性。
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来源期刊
Northwest Science
Northwest Science 环境科学-生态学
CiteScore
1.30
自引率
0.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The pages of Northwest Science are open to original and fundamental research in the basic, applied, and social sciences. All submissions are refereed by at least two qualified peer reviewers. Papers are welcome from authors outside of the Pacific Northwest if the topic is suitable to our regional audience.
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