The role of demographic compensation in stabilising marginal tree populations in North America,Ecology Letters

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The role of demographic compensation in stabilising marginal tree populations in North America
Ecology Letters ( IF 7.6 ) Pub Date : 2022-05-22 , DOI: 10.1111/ele.14028
Xianyu Yang _{1,

2,

3} , Amy L Angert ₃ , Pieter A Zuidema ₄ , Fangliang He ₅ , Shongming Huang ₆ , Shouzhong Li ₇ , Shou-Li Li ₈ , Nathalie I Chardon ₃ , Jian Zhang _{1,

2}

Affiliation

Demographic compensation—the opposing responses of vital rates along environmental gradients—potentially delays anticipated species’ range contraction under climate change, but no consensus exists on its actual contribution. We calculated population growth rate (λ) and demographic compensation across the distributional ranges of 81 North American tree species and examined their responses to simulated warming and tree competition. We found that 43% of species showed stable population size at both northern and southern edges. Demographic compensation was detected in 25 species, yet 15 of them still showed a potential retraction from southern edges, indicating that compensation alone cannot maintain range stability. Simulated climatic warming caused larger decreases in λ for most species and weakened the effectiveness of demographic compensation in stabilising ranges. These findings suggest that climate stress may surpass the limited capacity of demographic compensation and pose a threat to the viability of North American tree populations.

中文翻译：

人口补偿在稳定北美边缘树木种群中的作用

人口补偿 - 沿环境梯度的生命速率的相反反应 - 可能会延迟预期物种在气候变化下的范围收缩，但对其实际贡献尚无共识。我们计算了北美 81 种树种分布范围内的人口增长率 (λ) 和人口补偿，并检查了它们对模拟变暖和树木竞争的反应。我们发现 43% 的物种在北部和南部边缘都表现出稳定的种群规模。在 25 个物种中检测到人口补偿，但其中 15 个物种仍显示出从南部边缘退缩的可能，表明仅靠补偿无法维持范围稳定。模拟的气候变暖导致大多数物种的 λ 下降幅度更大，并削弱了人口补偿在稳定范围内的有效性。这些研究结果表明，气候压力可能超过人口补偿的有限能力，并对北美树木种群的生存能力构成威胁。

更新日期：2022-05-22

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