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2021年北美西部热浪的广泛生态反应和级联效应

Julia K Baum¹, Margaret A Slein^2,3, Josef C Garen^2,4

¹Department of Biology, University of Victoria, Victoria, British Columbia, Canada. baum@uvic.ca.

Nature ecology & evolution

|March 12, 2026

概括

2021年北美西部的热浪严重影响了超过75%的研究物种,整个生态系统的反应各不相同. 这凸显了了解和管理极端天气事件的迫切需要.

科学领域:

生态生态学生态生态学
气候科学气候科学
环境科学环境科学

背景情况:

极端天气事件,如热浪,在全球范围内频率和强度都在增加.
极端天气对生态的影响比逐渐的气候变化要了解得更少,因为它们的性质不可预测.
2021年北美西部的热浪是历史上极端的事件,其显著的生态后果尚未得到充分评估.

研究的目的:

为了量化2021年北美西部热浪对生态的影响.
评估物种对极端高温的反应的变异性.
了解生态系统层面的变化,包括生产力,水文和野火活动.

主要方法:

综合了气象,生态,水文和野火数据.
利用基于过程的建模来量化热浪及其影响.
进行了对32种陆地和海洋物种的元分析.

主要成果:

超过75%的被研究的种类经历了负面影响,反应差异很大 (99%的下降到89%的增加).
与鸟类和哺乳动物相比,对静坐性海洋无脊椎动物,藻类和植物的影响更大.
生态系统的生产率有显著的变化,在较冷的地区增加,在干旱地区减少. 溪流和野火活动也显示出显著的变化.

结论:

物种对热浪的反应是复杂的,受到热敏度,适应能力和环境因素的影响.
极端的热浪会对陆地和海洋生态系统造成重大,多方面的生态破坏.
协调策略对于预测,检测和管理日益升级的热浪威胁至关重要.

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