Increasing temporal variance leads to stable species range limits

Increasing temporal variance leads to stable species range limits
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增加时间方差导致稳定的物种范围限制

DOI:
10.1098/rspb.2022.0202
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发表时间:
2022
期刊:
Proceedings of the Royal Society B: Biological Sciences
影响因子:
--
通讯作者:
Weiss-Lehman, Christopher
Weiss-Lehman, Christopher
中科院分区:
--
文献类型:
--
作者:
Benning, John W.;Hufbauer, Ruth A.;Weiss-Lehman, Christopher

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是什么阻止了一个物种的种群适应该物种地理分布之外的新环境?以前的模型强调了基因在空间环境梯度上的流动如何决定物种的扩张与灭绝以及物种范围限制的位置。然而,空间只是环境变化的两个轴之一环境也随时间变化,我们知道时间环境变化对人口统计和进化有重要影响。我们使用分析和基于个体的进化模型来探索环境条件的时间变化如何影响种群在空间环境梯度上的传播。我们发现,时间的变化大大改变了我们的预测范围动态相比,时间静态的环境。当景观的时间方差相等时,物种的命运(扩张与灭绝)取决于环境波动的时间自相关程度与空间环境梯度的陡度之间的相互作用。当景观的时间变化的幅度变化时,稳定的范围限制形式,这种变化增加适应不良足以防止当地的持久性。这些结果说明了关键的影响,时间变化的可能性种群殖民新的栖息地和物种的范围限制的位置。
What prevents populations of a species from adapting to the novel environments outside the species' geographic distribution? Previous models highlighted how gene flow across spatial environmental gradients determines species expansion versus extinction and the location of species range limits. However, space is only one of two axes of environmental variation—environments also vary in time, and we know temporal environmental variation has important consequences for population demography and evolution. We used analytical and individual-based evolutionary models to explore how temporal variation in environmental conditions influences the spread of populations across a spatial environmental gradient. We find that temporal variation greatly alters our predictions for range dynamics compared to temporally static environments. When temporal variance is equal across the landscape, the fate of species (expansion versus extinction) is determined by the interaction between the degree of temporal autocorrelation in environmental fluctuations and the steepness of the spatial environmental gradient. When the magnitude of temporal variance changes across the landscape, stable range limits form where this variance increases maladaptation sufficiently to prevent local persistence. These results illustrate the pivotal influence of temporal variation on the likelihood of populations colonizing novel habitats and the location of species range limits.
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