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Coexistence, dispersal and spatial structure in metacommunities: a stochastic model approach
Theoretical Ecology ( IF 1.2 ) Pub Date : 2021-02-02 , DOI: 10.1007/s12080-020-00496-1
Mauricio Tejo , Cristóbal Quiñinao , Rolando Rebolledo , Pablo A. Marquet

We propose a stochastic model for interacting species in a metacommunity in order to study the factors affecting the intensity of the competition/colonization trade-off as a coexistence mechanism in metacommunities. We particularly focus on the role of the number of local communities and the number of refuges for the inferior competitor. The stochastic component is associated with the dispersal process and is represented by Poisson random measures. Thus, this stochastic model includes two dynamic scales: a continuous one, which refers to the interactions among species, and a low frequency one, referring to dispersal following a Poisson scheme. We show the well-posedness of the model and that it is possible to study its long-term behavior using Lyapunov exponents; the extinction of a species is associated with a negative slope in the time trajectory of the Lyapunov exponent, otherwise, it is equal to zero. We show that the competition/colonization trade-off is a function of the dispersal rate of the inferior competitor, and that it becomes less intense as the number of local communities increases, while the opposite is true with an increase in the number of refuges for the inferior competitor. We also show that under a priority effect type of scenario, dispersal can reverse priority effects and generate coexistence. Our results emphasize the importance of coexistence mechanisms related to the topology of the system of local communities, and its relationship with dispersal, in affecting the result of competition in local communities.



中文翻译:

元社区中的共存,分散和空间结构:一种随机模型方法

为了研究影响竞争/殖民权衡的强度作为元社区中的共存机制的因素,我们提出了一个元社区中物种相互作用的随机模型。我们特别关注本地社区的数量和劣等竞争对手的避难所的数量。随机成分与扩散过程相关,并由泊松随机测度表示。因此,这种随机模型包括两个动态标度:一个连续的标度,指的是物种之间的相互作用;另一个是低频的标度,指的是遵循泊松方案的分散。我们展示了该模型的适定性,并且有可能使用Lyapunov指数研究其长期行为。一个物种的灭绝与Lyapunov指数的时间轨迹中的负斜率相关,否则等于零。我们表明,竞争/殖民化权衡是劣等竞争者的扩散率的函数,随着当地社区数量的增加,竞争/殖民化的权衡减弱,反之,避难所的数量增加则相反。劣等竞争对手。我们还表明,在情景的优先效果类型下,分散可以逆转优先效果并产生共存。我们的研究结果强调了与当地社区系统拓扑相关的共存机制及其与分散关系的影响,这对影响本地社区竞争的结果至关重要。我们表明,竞争/殖民化权衡是劣等竞争者的扩散率的函数,随着当地社区数量的增加,竞争/殖民化的权衡减弱,反之,避难所的数量增加则相反。劣等竞争对手。我们还表明,在情景的优先效果类型下,分散可以逆转优先效果并产生共存。我们的研究结果强调了与当地社区系统拓扑相关的共存机制及其与分散关系的影响,这对影响本地社区竞争的结果至关重要。我们表明,竞争/殖民化权衡是劣等竞争者的扩散率的函数,随着当地社区数量的增加,竞争/殖民化的权衡减弱,反之,避难所的数量增加则相反。劣等竞争对手。我们还表明,在情景的优先效果类型下,分散可以逆转优先效果并产生共存。我们的研究结果强调了与当地社区系统拓扑相关的共存机制及其与分散关系的影响,这对影响本地社区竞争的结果至关重要。反之亦然,劣等竞争对手的庇护所数量增加。我们还表明,在情景的优先效果类型下,分散可以逆转优先效果并产生共存。我们的研究结果强调了与当地社区系统拓扑相关的共存机制及其与分散关系的影响,这对影响本地社区竞争的结果至关重要。反之亦然,劣等竞争对手的庇护所数量增加。我们还表明,在情景的优先效果类型下,分散可以逆转优先效果并产生共存。我们的研究结果强调了与当地社区系统拓扑相关的共存机制及其与分散关系的影响,这对影响本地社区竞争的结果至关重要。

更新日期:2021-02-02
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