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首页> 外文期刊>California Fish and Game >Water temperature thresholds for coho salmon in a spring-fed river, Siskiyou County, California
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Water temperature thresholds for coho salmon in a spring-fed river, Siskiyou County, California

机译：加利福尼亚锡斯基尤县春季喂养的河中银大麻哈鱼的水温阈值

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摘要

Coho salmon (Oncorhynchus kisutch) populations in California have declined at an alarming rate in the last 40 to 50 years. Detrimental water temperatures in the Shasta River have contributed to this decline. At one time, the Shasta River was a cool water stream with flows dominated by springs originating from underground flow from Mt. Shasta and snowmelt from the Eddy Mountains. Agricultural practices and water diversions have eliminated much of the historic high-quality aquatic habitat, and only remnants of the once abundant cool water habitat exist. Cool water temperatures are critical for the freshwater phase of the coho salmon life cycle, and are imperative for population recovery. Based on a literature review of the effects on the physiology, behavior, and survival of coho salmon, we break water temperatures into optimal, suboptimal, and detrimental ranges. Identifying water temperature thresholds for coho salmon will support the implementation of monitoring stations and adaptive management practices to assure that suboptimal temperature thresholds are not exceeded. It is well documented that the establishment and use of locally determined thresholds as performance criteria in the monitoring and adaptive management of ecosystems is critical to conducting restoration activities. We conclude that protecting the cool water produced by springs located in the upper Shasta River springs complex will improve the likelihood of coho salmon persistence in this watershed and contribute to coho salmon recovery.
机译：在过去的40到50年中，加利福尼亚的Coho鲑（Oncorhynchus kisutch）种群以惊人的速度下降。沙斯塔河的有害水温是造成这一下降的原因。沙斯塔河（Shasta River）曾经是一条凉爽的水流，其流量以泉水为主，而泉水来自山（Mt.来自埃迪山的沙斯塔和融雪。农业实践和水资源转移已消除了许多历史悠久的高质量水生生境，仅存在曾经丰富的凉水生境的残余物。凉水温度对于银大麻哈鱼生命周期的淡水阶段至关重要，对于种群恢复至关重要。基于对银大麻哈鱼的生理，行为和生存的影响的文献综述，我们将水温分为最佳，次优和有害范围。确定银大麻哈鱼的水温阈值将支持监测站和适应性管理措施的实施，以确保不超过次优温度阈值。有充分的文献记载，在生态系统的监测和适应性管理中，建立和使用本地确定的阈值作为绩效标准对于开展恢复活动至关重要。我们得出的结论是，保护位于沙斯塔河上游泉水综合体的泉水所产生的凉水，将提高银鲑在该流域中持久存在的可能性，并有助于银鲑的恢复。

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