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首页> 外文期刊>Environmental & Resource Economics >Managing Nonindigenous Invasive Species: Insights from Dynamic Analysis
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Managing Nonindigenous Invasive Species: Insights from Dynamic Analysis

机译：管理非本地入侵物种：动态分析的见解

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摘要

Accidental introductions of nonindigenous invasive species impair ecosystems, increase the risk of native species extinctions, and cause substantial economic damages on a worldwide basis. Despite the magnitude of the problem, very little economic analysis has been focused on this topic to date. This manuscript develops an optimal control model of the management of a nonindigenous species stock following its introduction and establishment. We find that the influence of changes in ecological and human factors (such as the invader's intrinsic growth rate, carrying capacity, and the effectiveness of invasive species management technologies) on the optimal level of management are analytically (mathematically) ambiguous in sign and depend on the values of other parameters and variables. To estimate actual numerical solutions to the model and conduct sensitivity analyses, we construct a case study illustration based on invasive plant species on arid lands. The illustration shows that the optimal level of management effort is sensitive to biological and ecological factors (the stock's intrinsic rate of growth, the carrying capacity afforded the invasive species, and the form of the invader's growth function) that are species- and site-specific as well as uncertain given currently available scientific information. This highlights the need for better collaboration and information transfer between economists and scientists interested in this topic. Given that resources for addressing nonindigenous species threats typically are quite constrained, and complete eradication in a particular area is often technically infeasible, the model provides useful insight on optimal levels of ongoing management and how they may vary according to bioeconomic factors.
机译：意外引入非本地入侵物种会破坏生态系统，增加本地物种灭绝的风险，并在全球范围内造成重大经济损失。尽管问题的严重性，迄今为止，很少有经济分析集中在此主题上。在引入和建立后，该手稿为非本地物种种群的管理开发了一个最佳控制模型。我们发现，生态和人为因素（例如入侵者的内在增长率，承载能力和入侵物种管理技术的有效性）变化对最佳管理水平的影响在分析（数学）上是模棱两可的，并取决于其他参数和变量的值。为了估计该模型的实际数值解并进行敏感性分析，我们基于干旱地区的入侵植物物种构建了一个案例研究插图。该图表明，最佳管理水平对特定于物种和地点的生物和生态因素（种群的内在增长率，入侵物种的承载能力以及入侵者的生长功能形式）敏感。以及目前已知的不确定科学信息。这凸显了对这一主题感兴趣的经济学家和科学家之间需要更好的合作和信息传递的需求。鉴于解决非本地物种威胁的资源通常非常有限，并且在特定区域彻底根除通常在技术上是不可行的，因此该模型提供了有关进行中管理的最佳水平以及它们如何根据生物经济因素而变化的有用见解。

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