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arXiv 2009.14036math.AP
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一类比率依赖的捕食-食饵模型的带Stefan条件的自由边界问题

A Free Boundary Problem with a Stefan Condition for a Ratio-dependent Predator-prey Model

Lingyu Liu

摘要:

本文研究了一类具有由食饵和捕食者共同引起的自由边界的比率依赖的捕食-食饵模型。我们研究了这两个种群的长时间行为,证明了一个扩散-消失二分法,即当t趋于无穷大时,捕食者和被捕食者要么成功地扩散到整个空间并在新的环境中生存,要么在一个有界区域内扩散并最终灭绝。然后得到了控制扩散和消失的准则。最后,当扩展发生时,我们提供了h(t)的渐近扩展速度的一些估计。

英文摘要:

In this paper we study a ratio-dependent predator-prey model with a free boundary causing by both prey and predator over a one dimensional habitat. We study the long time behaviors of the two species and prove a spreading-vanishing dichotomy, namely, as t goes to infinity, both prey and predator successfully spread to the whole space and survive in the new environment, or they spread within a bounded area and die out eventually. Then the criteria governing spreading and vanishing are obtained. Finally, when spreading occurs, we provide some estimates to the asymptotic spreading speed of h(t).

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