Riverine fish populations depend on habitats supporting their resource and life history needs. Dynamic streamflow caused by river regulation or natural events influences the distribution of downstream habitat characteristics. Through studying habitat selection, we can identify the most utilized and valuable habitats for the success of native fishes. We determined seasonal habitat selection of two common, native fish species on the Osage River downstream of Bagnell Dam, a hydroelectric dam in central Missouri, from April 2016 to June 2017 using radio telemetry. Spotted Bass (Micropterus punctulatus) are nest‐guarders, sight feeders, and habitat generalists, whereas Shorthead Redhorse (Moxostoma macrolepidotum) are fluvial dependent, migratory, and benthic feeders. Bayesian discrete choice analyses determined that both species selected particular water depth, velocity, and presence of submerged cover in some or all seasons, even as available habitat changed. Spotted Bass selected water depths <4.0 m near submerged cover during all seasons, low velocity during spring and summer, and near‐bank habitat in all seasons except spring. Shorthead Redhorse used fast flowing habitat during spring, 0.4–1.1 m/s velocity during summer, and low velocity in fall and winter (0.1–0.5 m/s). Shorthead Redhorse used submerged cover in all seasons except summer and selected specific ranges of depth within spring (2.4–4.4 m), summer (3.3–6.7 m), and winter (1.1–2.3 m). Our findings suggest that maintaining habitats with cover and diverse water depths and velocities, particularly both low and high velocity habitats during spring, may promote resilience by providing beneficial habitats for native fishes.

中文翻译：

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美国中西部受管制的河流中斑点鲈和短头红马的栖息地季节选择

江河鱼类种群依赖能够支持其资源和生活史需求的栖息地。由河流调节或自然事件引起的动态水流影响下游生境特征的分布。通过研究栖息地选择，我们可以确定成功利用本地鱼类的最有价值的栖息地。我们使用无线电遥测技术从2016年4月至2017年6月确定了密苏里州中部水力发电大坝Bagnell大坝下游Osage河上两种常见的本地鱼类物种的季节性栖息地选择。斑鲈（Micropterus punctulatus）是筑巢护卫者，观赏动物和栖息地的通才，而短头红马（Moxostoma macrolepidotum）是河流相关的，迁徙的和底栖的饲养者。贝叶斯离散选择分析确定，即使可用的栖息地发生了变化，两个物种在某些或全部季节中都选择了特定的水深，流速和淹没覆盖的存在。斑点鲈鱼在所有季节都选择淹没覆盖层以下的水深<4.0 m，在春季和夏季选择低流速，在除春季以外的所有季节都选择近岸栖息地。短头红马在春季使用快速流动的栖息地，夏季使用0.4-1.1 m / s的速度，秋季和冬季使用低速的栖息地（0.1-0.5 m / s）。除夏季外，Shorthead Redhorse在所有季节都使用淹没覆盖层，并且在春季（2.4–4.4 m），夏季（3.3–6.7 m）和冬季（1.1–2.3 m）中选择了特定的深度范围。我们的研究结果表明，保持栖息地的覆盖范围和水深和流速都不同，