The South Fork Snake River supports one of the few remaining robust populations of fluvial Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri in Idaho. Since the early to mid‐2000s, salmonid populations on the South Fork Snake River have been intensively monitored and managed to limit the abundance of introduced Rainbow Trout O. mykiss, which have been increasing in abundance relative to Yellowstone Cutthroat Trout. Integrated population models (IPMs) were built using multiple data sets (abundance, survival, and fecundity data) to evaluate the effectiveness of management actions. Modeling results suggested that Yellowstone Cutthroat Trout survival at ages 0 and 2 was influenced by inter‐ and intracohort competition with both adult Rainbow Trout and adult Yellowstone Cutthroat Trout. Decreasing minimum winter discharge from Palisades Reservoir appeared to negatively affect the population growth rate of Yellowstone Cutthroat Trout; however, the effect on survival of individual life stages was minimal. Use of the IPM allowed for evaluation of life‐stage‐specific dynamics that would be lacking when using alternative analytical methods. It is apparent from the results of this study that the population bottlenecks for Yellowstone Cutthroat Trout in the South Fork Snake River occurred at ages 0 and 2 as a result of inter‐ and intraspecific density‐dependent mechanisms. Thus, management actions that target these life stages should be continued or expanded.

中文翻译：

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使用综合人口模型评估黄石残酷鳟鱼对管理行动的反应

南叉蛇河是爱达荷州剩余的少量黄河流域残酷鳟鱼鳟鱼Oncorhynchus clarkii bouvieri的种群之一。自2000年代初至中期以来，对南叉蛇河上的鲑鱼种群进行了严格的监测，并设法限制了引入的虹鳟鱼的数量。，相对于黄石残酷的鳟鱼，丰度一直在增加。使用多个数据集（丰度，存活率和繁殖力数据）构建了综合人口模型（IPM），以评估管理措施的有效性。建模结果表明，与成年虹鳟和成年黄石残酷鳟鱼竞争的群体间和群体内竞争影响了黄石残酷鳟鱼在0和2岁的生存。帕利塞兹水库（Palisades Reservoir）冬季最低出水量的减少似乎对黄石残酷鳟鱼的人口增长率产生负面影响；但是，对个体生命阶段生存的影响很小。使用IPM可以评估使用替代分析方法时缺乏生命阶段的动态。从这项研究的结果可以明显看出，由于种间和种内密度依赖性机制，南叉蛇河黄石Yellow鱼鳟鱼的种群瓶颈发生在0和2岁。因此，针对这些生命阶段的管理措施应继续或扩大。