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Biodiversity and Optimal Multi-species Ecosystem Management

机译:生物多样性和最佳的多物种生态系统管理

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摘要

We analyze optimal multi-species management in a dynamic bio-economic model taking into account both harvesting profit and biodiversity value. Within an analytical model, we show that extinction is never optimal when a global biodiversity value is taken into account. Moreover, a stronger preference for species diversity leads to a more even distribution of stock sizes in the optimal steady state, and a higher value of biodiversity increases steady state stock sizes for all species when species are ecologically independent or symbiotic. For a predator-prey ecosystem, the effects may be positive or negative depending on relative prices and the strength of species interaction. The analytical results are illustrated and extended using an age-structured three-species predator-prey model for the Baltic cod, sprat, and herring fisheries. In this quantitative application, we find that using stock biomass or stock numbers as abundance indicators in the biodiversity index may lead to opposite results.
机译:我们在考虑到收获利润和生物多样性价值的同时,在动态生物经济模型中分析了最佳的多物种管理。在分析模型中,我们表明,如果考虑到全球生物多样性价值,灭绝绝不会是最佳的。此外,对物种多样性的更强偏好会导致最佳稳态下种群规模分布更均匀,而当物种在生态上独立或共生时,更高的生物多样性价值会增加所有物种的稳态种群规模。对于捕食者-捕食者生态系统,其影响可能是正面还是负面的,具体取决于相对价格和物种相互作用的强度。对于波罗的海鳕鱼,鲱鱼和鲱鱼渔业,使用年龄结构的三物种捕食者—捕食模型对分析结果进行了说明和扩展。在这种定量应用中,我们发现在生物多样性指数中使用种群生物量或种群数量作为丰度指标可能会得出相反的结果。

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