Asymmetric migration decreases stability but increases resilience in a heterogeneous metapopulation.
Asymmetric migration decreases stability but increases resilience in a heterogeneous metapopulation.
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DOI：
10.1038/s41467-018-05424-w
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发表时间：
2018-07-30
影响因子：
16.6
通讯作者：
Gore J
中科院分区：
文献类型：
--
作者：
Limdi A;Pérez-Escudero A;Li A;Gore J
许多自然种群在空间上是分布的，形成了一个由迁移联系在一起的亚种群网络。迁移模式往往是不对称和异质的，对物种的生态和进化产生重要影响。在这里，我们调查实验如何不对称的迁移和异质结构影响一个简单的集合种群的芽殖酵母，形成一个菌株，产生一个公共产品和非生产菌株，从它的好处。我们研究集合种群与星星拓扑结构和不对称的迁移，发现他们所有的亚群有一个更高的比例比孤立的人口生产者。此外，集合种群对挑战性环境的耐受性较低，但对瞬时扰动的弹性较高。之所以会出现这种明显的悖论，是因为对持续挑战的容忍度取决于网络中最弱的子群体，而对瞬时扰动的弹性则取决于最强的子群体。斑块间的不对称运动会影响生态集合种群的稳定性，但这很难进行实证检验。在这里，Limdi等人使用实验酵母集合种群来表明，不对称迁移降低了稳定性，但增加了对瞬时冲击的恢复力。
Many natural populations are spatially distributed, forming a network of subpopulations linked by migration. Migration patterns are often asymmetric and heterogeneous, with important consequences on the ecology and evolution of the species. Here we investigate experimentally how asymmetric migration and heterogeneous structure affect a simple metapopulation of budding yeast, formed by one strain that produces a public good and a non-producer strain that benefits from it. We study metapopulations with star topology and asymmetric migration, finding that all their subpopulations have a higher fraction of producers than isolated populations. Furthermore, the metapopulations have lower tolerance to challenging environments but higher resilience to transient perturbations. This apparent paradox occurs because tolerance to a constant challenge depends on the weakest subpopulations of the network, while resilience to a transient perturbation depends on the strongest ones. Asymmetrical movement among patches could affect the stability of ecological metapopulations, but this is difficult to test empirically. Here, Limdi et al. use experimental yeast metapopulations to show that asymmetric migration decreases stability but increases resilience to transient shocks.
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