While navigating through the same migratory corridor, different species may experience differing reproductive success due the interaction of species-specific movement behavior with habitat configuration. We contrasted the migratory behavior of White Sturgeon Acipenser transmontanus and fall-run Chinook Salmon Oncorhynchus tshawytscha , two native fishes in Central Valley of California. These species co-occur in the region’s Yolo Bypass floodplain seasonally, but they represent disparate reproductive strategies: White Sturgeon are iteroparous, spawning multiple times throughout their lifespan, while Chinook Salmon are semelparous, spawning only once in their lifespan. Except for brief windows when the Yolo Bypass connected to the Sacramento River during flood conditions, migrating White Sturgeon and Chinook Salmon that entered the Bypass from 2012 to 2018 had to turn around and exit it in order to complete a successful spawning migration up the Sacramento River. This “exit behavior” was critical to migratory success when the Bypass was not flooded. Between March 2012 and May 2018, the median probability of acoustically-tagged fall-run Chinook Salmon exiting the Yolo Bypass at its southern extent was estimated to be 0.74 (0.58–0.87 95% credible interval), while an individual White Sturgeon had a median exit probability of 0.99 (0.96–1.00 95% credible interval). Our results suggest that White Sturgeon successfully exit the Yolo Bypass more consistently than fall-run Chinook Salmon, indicating that fall-run Chinook Salmon are at higher risk of stranding in the Yolo Bypass. The difference in probability of exit between these two species has implications for how to manage for migratory success in altered habitats. Floodplain · Fish passage · Bayesian · Telemetry · Behavioral ecology · Movement · Stranding.

中文翻译：

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对比加利福尼亚修改后的洪泛区白鲟和奇努克鲑鱼的迁徙行为和搁浅风险

在穿越相同的迁徙走廊时，由于物种特定的运动行为与栖息地配置的相互作用，不同的物种可能会经历不同的繁殖成功。我们对比了白鲟 Acipenser transmontanus 和秋季奔跑的 Chinook Salmon Oncorhynchus tshawytscha 这两种加利福尼亚中央山谷的本地鱼类的洄游行为。这些物种季节性地共同出现在该地区的 Yolo Bypass 洪泛区，但它们代表了不同的繁殖策略：白鲟是反复繁殖的，在其一生中多次产卵，而奇努克鲑鱼是半产的，在其一生中仅产卵一次。除了在洪水条件下 Yolo Bypass 连接到萨克拉门托河时的短暂窗口，从 2012 年到 2018 年进入绕道的白鲟和奇努克鲑鱼不得不掉头离开，以便成功地沿萨克拉门托河产卵迁移。当旁路没有被淹没时，这种“退出行为”对于迁徙成功至关重要。在 2012 年 3 月至 2018 年 5 月期间，声学标记的秋游奇努克鲑鱼在其南部离开 Yolo 绕道的概率中值估计为 0.74（0.58-0.87 95% 可信区间），而单个白鲟鱼的中值概率为退出概率为 0.99（0.96–1.00 95% 可信区间）。我们的结果表明，白鲟鱼比秋游的奇努克鲑鱼更能成功地退出 Yolo 绕道，这表明秋游的奇努克鲑鱼在 Yolo 绕道中搁浅的风险更高。这两个物种之间退出概率的差异对如何在改变的栖息地中管理迁徙成功具有影响。洪泛区·鱼类通道·贝叶斯·遥测·行为生态学·运动·搁浅。