Recovering endangered species populations when confronted with the threat of invasive species is an ongoing natural resource management challenge. While eradication of the invasive species is often the optimal economic solution, it may not be a feasible nor desirable management action in other cases. For example, when invasive species are desired in one area, but disperse into areas managed for endangered species, managers may be interested in persistent, but cost-effective means of managing dispersers rather than eradicating the source. In the Colorado River, a nonnative rainbow trout () sport fishery is desired within Glen Canyon National Recreation Area, however, dispersal downriver into the Grand Canyon National Park is not desired as rainbow trout negatively affect endangered humpback chub (). Here, we developed a bioeconomic model incorporating population abundance goals and cost-effectiveness analyses to approximate the optimal control strategies for invasive rainbow trout conditional on achieving endangered humpback chub adult population abundance goals. Model results indicated that the most cost-effective approach to achieve target adult humpback chub abundance was a high level of rainbow trout control over moderately high rainbow trout population abundance. Adult humpback chub abundance goals were achieved at relatively low rainbow trout abundance and control measures were not cost-effective at relatively high rainbow trout abundance. Our model considered population level dynamics, species interaction and economic costs in a multi-objective decision framework to provide a preferred solution to long-run management of invasive and native species.

中文翻译：

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确定具有成本效益的入侵物种控制措施，以增加美国大峡谷的濒危物种数量

在面临入侵物种的威胁时恢复濒危物种种群是自然资源管理面临的持续挑战。虽然根除入侵物种通常是最佳的经济解决方案，但在其他情况下，它可能不是可行或理想的管理行动。例如，当一个地区需要入侵物种，但它们扩散到濒危物种管理区域时，管理者可能感兴趣的是持久的、但具有成本效益的管理扩散者的方法，而不是根除源头。在科罗拉多河，格伦峡谷国家游乐区内需要开展非本地虹鳟鱼游钓活动，但不希望将虹鳟鱼扩散到下游的大峡谷国家公园，因为虹鳟鱼会对濒临灭绝的座头鲸产生负面影响。在这里，我们开发了一个生物经济模型，结合了种群丰度目标和成本效益分析，以近似实现濒危座头鲸成年种群丰度目标为条件的入侵虹鳟鱼的最佳控制策略。模型结果表明，实现成年座头鲸丰度目标的最具成本效益的方法是对虹鳟鱼种群丰度进行高水平控制。成年座头鲢丰度目标是在虹鳟丰度相对较低的情况下实现的，而在虹鳟丰度相对较高的情况下，控制措施并不具有成本效益。我们的模型在多目标决策框架中考虑了种群水平动态、物种相互作用和经济成本，为入侵物种和本地物种的长期管理提供了首选解决方案。