Range dynamics mediated by compensatory life stage responses to experimental climate manipulations,Ecology Letters

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Range dynamics mediated by compensatory life stage responses to experimental climate manipulations
Ecology Letters ( IF 7.6 ) Pub Date : 2021-02-08 , DOI: 10.1111/ele.13693
Meagan F. Oldfather _{1,

2} , Michael J. Koontz ₃ , Daniel F. Doak ₄ , David D. Ackerly _{2,

5,

6}

Affiliation

The expectations of polar or upslope distributional shifts of species ranges in response to warming climate conditions have been recently questioned. Diverse responses of different life stages to changing temperature and moisture regimes may alter these predicted range dynamics. Furthermore, the climate driver(s) influencing demographic rates, and the contribution of each demographic rate to population growth rate (λ), may shift across a species range. We investigated these demographic effects by experimentally manipulating climate and measuring responses of λ in nine populations spanning the elevation range of an alpine plant (Ivesia lycopodioides). Populations exhibited stable growth rates (λ ~ 1) under naturally wet conditions and declining rates (λ < 1) under naturally dry conditions. However, opposing vital rate responses to experimental heating and watering lead to negligible or negative effects on population stability. These findings indicate that life stage–specific responses to changing climate can disrupt the current relationships between population stability and climate across species ranges.

中文翻译：

补偿性生命阶段对实验性气候操纵的响应介导的距离动态

近来人们质疑对气候变化引起的物种范围的极地或上坡分布变化的期望。不同生命阶段对变化的温度和湿度状况的不同反应可能会改变这些预测的范围动态。此外，影响人口统计率的气候驱动因素以及每个人口统计率对人口增长率（λ）的贡献可能会在整个物种范围内变化。我们通过实验性控制气候并测量跨越高山植物（Ivesia lycopodioides）的九个种群中λ的响应，研究了这些人口统计学影响）。种群在自然潮湿条件下表现出稳定的增长率（λ〜1），在自然干燥条件下表现出下降的速率（λ<1）。但是，相反的生命率对实验加热和浇水的响应导致对种群稳定性的影响可以忽略不计或产生负面影响。这些发现表明，生命阶段特定的对气候变化的反应可能会破坏跨物种范围的种群稳定与气候之间的当前关系。

更新日期：2021-03-16

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