Danino Matan, Kessler David A, Shnerb Nadav M
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel.
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel.
Theor Popul Biol. 2018 Feb;119:57-71. doi: 10.1016/j.tpb.2017.11.003. Epub 2017 Dec 2.
The dynamics of two competing species in a finite size community is one of the most studied problems in population genetics and community ecology. Stochastic fluctuations lead, inevitably, to the extinction of one of the species, but the relevant timescale depends on the underlying dynamics. The persistence time of the community has been calculated both for neutral models, where the only driving force of the system is drift (demographic stochasticity), and for models with strong selection. Following recent analyses that stress the importance of environmental stochasticity in empirical systems, we present here a general theory of the persistence time of a two-species community where drift, environmental variations and time independent selective advantage are all taken into account.
有限规模群落中两个竞争物种的动态变化是种群遗传学和群落生态学中研究最多的问题之一。随机波动不可避免地导致其中一个物种灭绝，但相关的时间尺度取决于潜在的动态变化。群落的持续时间已经在中性模型（系统的唯一驱动力是漂移（人口统计学随机性））和具有强选择作用的模型中进行了计算。继最近强调环境随机性在经验系统中的重要性的分析之后，我们在此提出一个关于两物种群落持续时间的一般理论，其中考虑了漂移、环境变化和与时间无关的选择优势。
