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arXiv 1906.05960q-bio.PE
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一类捕食者搜索率可变的捕食者-食饵模型的全局分析

Global analysis of a predator-prey model with variable predator search rate

Ben Dalziel, Enrique Thomann, Jan Medlock, Patrick De Leenheer

摘要:

考虑了一个修正的Rosenzweig-MacArthur捕食-食饵模型,其前提是捕食者的搜索速率依赖于食饵密度,而不是常数.对该模型的全局行为进行了完整的分析,结果表明该模型具有与经典Rosenzweig-MacArthur模型相似的二分法:共存平衡态是全局稳定的;或者是不稳定的,然后存在唯一的全局稳定的极限环.我们讨论的相似之处,但也有重要的区别,我们的模型和罗森维格-麦克阿瑟模型。主要区别在于:1.在罗森茨威格-麦克阿瑟模型中总是出现的富集悖论,在这里并不总是发生。即使出现富集悖论,捕食者也可以通过降低搜索率来适应,从而有效地稳定系统。

英文摘要:

We consider a modified Rosenzweig-MacArthur predator-prey model, based on the premise that the search rate of predators is dependent on the prey density, rather than constant. A complete analysis of the global behavior of the model is presented, and shows that the model exhibits a dichotomy similar to the classical Rosenzweig-MacArthur model: either the coexistence steady state is globally stable; or it is unstable, and then a unique, globally stable limit cycle exists. We discuss the similarities, but also important differences between our model and the Rosenweig-MacArthur model. The main differences are that: 1. The paradox of enrichment which always occurs in the Rosenzweig-MacArthur model, does not always occur here, and 2. Even when the paradox of enrichment occurs, predators can adapt by lowering their search rate, and effectively stabilize the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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