Impact of colonization history on the composition of ecological systems.
Impact of colonization history on the composition of ecological systems.
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DOI：
10.1103/physreve.103.052403
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发表时间：
2021-05
期刊：
影响因子：
--
通讯作者：
Liu YY
中科院分区：
文献类型：
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作者：
Zhao N;Saavedra S;Liu YY
生态系统的观察研究表明，在群落组装（也称为殖民历史）期间，不同的物种到达顺序可能会产生不同的物种组成。种群动态状态空间正向存在多重内部均衡，自然会导致最终状态的历史依赖性。然而，目前尚不清楚在缺乏多重内部平衡的情况下，殖民历史是否以及在什么条件下将主导群落组成。在这里，通过考虑一次只能入侵一个物种并且不存在反复入侵，我们提供了明确的证据，表明即使在不存在多个内部平衡的情况下，殖民历史也可以对生态系统的组成产生重大影响。特别是，我们首先推导出两个简单的规则，以确定在没有多重内部平衡和反复入侵的情况下，社区的组成是否取决于其殖民历史。然后，我们将它们应用于由广义 Lotka-Volterra (gLV) 动力学控制的社区，并提出一个数值方案来衡量殖民历史依赖性的概率。最后，我们通过数值模拟表明，对于具有单一内部平衡的 gLV 动力学，群落组成由殖民历史主导的概率随着群落规模、网络连通性和物种间内在增长率的变化而单调增加。这些结果表明，在缺乏多重内部平衡和反复入侵的情况下，群落组成是一个由生态动力学通过种间变异和区域库大小介导的概率过程。
Observational studies of ecological systems have shown that different species compositions can arise from distinct species arrival orders during community assembly—also known as colonization history. The presence of multiple interior equilibria in the positive orthant of the state space of the population dynamics will naturally lead to history dependency of the final state. However, it is still unclear whether and under which conditions colonization history will dominate community composition in the absence of multiple interior equilibria. Here, by considering that only one species can invade at a time and there are no recurrent invasions, we show clear evidence that the colonization history can have a big impact on the composition of ecological systems even in the absence of multiple interior equilibria. In particular, we first derive two simple rules to determine whether the composition of a community will depend on its colonization history in the absence of multiple interior equilibria and recurrent invasions. Then we apply them to communities governed by generalized Lotka-Volterra (gLV) dynamics and propose a numerical scheme to measure the probability of colonization history dependence. Finally, we show, via numerical simulations, that for gLV dynamics with a single interior equilibrium the probability that community composition is dominated by colonization history increases monotonically with community size, network connectivity, and the variation of intrinsic growth rates across species. These results reveal that in the absence of multiple interior equilibria and recurrent invasions community composition is a probabilistic process mediated by ecological dynamics via the interspecific variation and the size of regional pools.