arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.03686math.AP
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异质环境中个体扩散变异的种群:动力学和与简单扩散种群的竞争

Populations with individual variation in dispersal in heterogeneous environments: dynamics and competition with simply diffusing populations

Robert Stephen Cantrell, Chris Cosner, Xiao Yu

摘要:

我们考虑一个模型的人口在一个异质的环境中,与逻辑类型的本地人口动力学,假设个人可以在两个不同的非零扩散率之间切换。在一些自然系统中已经观察到这种开关行为。我们研究了环境异质性以及转换和扩散的速率如何影响种群的持久性。模型中的反应扩散系统在某些种群密度下是合作的,而在另一些种群密度下是竞争的。结果扩展了我们以前在均匀环境中的类似模型的工作。我们还考虑了两个种群之间的竞争,这两个种群在生态上是相同的,但其中一个种群以固定的速度扩散,另一个种群在两个不同的扩散速度之间切换。这样做的动机是为了深入了解何时切换可能比以固定速率扩散更有利。这是一个变化的经典结果,生态相同的竞争对手具有不同的固定扩散率,众所周知,较慢的扩散器获胜。

英文摘要:

We consider a model for a population in a heterogeneous environment, with logistic type local population dynamics, under the assumption that individuals can switch between two different nonzero rates of diffusion. Such switching behavior has been observed in some natural systems. We study how environmental heterogeneity and the rates of switching and diffusion affect the persistence of the population. The reaction diffusion systems in the models can be cooperative at some population densities and competitive at others. The results extend our previous work on similar models in homogeneous environments. We also consider competition between two populations that are ecologically identical, but where one population diffuses at a fixed rate and the other switches between two different diffusion rates. The motivation for that is to gain insight into when switching might be advantageous versus diffusing at a fixed rate. This is a variation on the classical results for ecologically identical competitors with differing fixed diffusion rates, where it is well known that the slower diffuser wins.

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