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arXiv 2104.01611q-bio.PE
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集合种群形成动力学中灭绝和同步的相互作用

The interplay of extinction and synchrony in the dynamics of metapopulation formation

John Vandermeer, Zachary Hajian-Forooshani

摘要:

集合种群的概念已经成为生态学中的经典。它的原始平均场形式提供了一个重要的直觉,即迁移和灭绝相互作用,以确定由亚种群组成的种群的动态。从概念上看,集合种群范式的本质是以局部灭绝的过程为中心的。我们注意到,有两种性质上不同的灭绝,渐进的和灾难性的,并探讨其对集合种群形成的动态使用离散迭代地图的影响。首先,通过修改经典的Logistic映射添加的Allee效应,我们表明,灾难性的局部排斥的亚种群是集合种群形成的先决条件。当亚群经历逐渐灭绝,增加迁移率的力量同步和驱动的集合种群低于Allee点,导致迁移引起的系统不稳定的参数空间。第二,一个映射(伯努利比特移位映射的扩展),同时探索人口行为的增长和减少模式。最后,我们总结了四个方面。1.在低迁移率下,集合种群可能比完全不相连的亚种群灭绝得更快。2.在稳定集合种群形成和种群同步之间存在一个梯度,从没有集合种群到集合种群再到同步的关键转变,后者经常导致集合种群灭绝。3.同步模式随着时间的推移而出现,导致同步群体和嵌合群体同时存在。4.存在两种不同的同步机制:i.灭绝和救援,ii.)在经典的混乱拉伸和折叠的修改拉伸反转。

英文摘要:

The idea of a metapopulation has become canonical in ecology. Its original mean field form provides the important intuition that migration and extinction interact to determine the dynamics of a population composed of subpopulations. From its conception, it has been evident that the very essence of the metapopulation paradigm centers on the process of local extinction. We note that there are two qualitatively distinct types of extinction, gradual and catastrophic, and explore their impact on the dynamics of metapopulation formation using discrete iterative maps. First, by modifying the classic logistic map with the addition of the Allee effect, we show that catastrophic local extinctions in subpopulations are a pre-requisite of metapopulation formation. When subpopulations experience gradual extinction, increased migration rates force synchrony and drive the metapopulation below the Allee point resulting in migration induced destabilization of the system across parameter space. Second, a sawtooth map (an extension of the Bernoulli bit shift map) is employed to simultaneously explore the increasing and decreasing modes of population behavior. We conclude with four generalizations. 1. At low migration rates, a metapopulation may go extinct faster than completely unconnected subpopulations. 2. There exists a gradient between stable metapopulation formation and population synchrony, with critical transitions from no metapopulation to metapopulation to synchronization, the latter frequently inducing metapopulation extinction. 3. Synchronization patterns emerge through time, resulting in synchrony groups and chimeric populations existing simultaneously. 4. There are two distinct mechanisms of synchronization: i. extinction and rescue and, ii.) stretch reversals in a modification of the classic chaotic stretching and folding.

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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