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随着气候变暖,河流两足动物的热死亡率的长期预测
Wilco C E P Verberk1, K Natan Hoefnagel1, Ignacio Peralta-Maraver2,3
1Department of Animal Ecology and Physiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, The Netherlands.
Global change biology
|July 4, 2023
概括
全球变暖将显著增加水生动物的死亡率. 这项研究开发了一个预测热应激影响的框架,揭示了适应过程.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候变化生物学 气候变化生物学
背景情况:
- 全球变暖需要了解热死亡率和热应激与其他环境因素的相互作用.
- 预测长期后果需要将生理耐受性与环境条件相结合.
研究的目的:
- 开发一个灵活的分析框架,用于预测热应激导致的死亡风险.
- 在各种环境条件和变暖场景下调查两足动物Dikerogammarus villosus和Echinogammarus trichiatus的耐热性.
主要方法:
- 实验室测量热承受度与现场温度和氧气记录的结合.
- 纳入生理适应效应和时间尺度差异.
- 在不同的变暖情景 (0°C,1°C,2°C) 下计算每日热死亡概率和累积年死亡率.
主要成果:
- 由于夏季气温上升,预计每年水生物种死亡率将大幅增加.
- 证明热适应和充足的氧化显著改善耐热性,在较长的时间尺度上效果放大.
- 根据变暖情景,预计到2100年D. villosus的死亡率将接近100%,E. trichiatus的死亡率将达到60%.
- 突出了死亡风险的空间变化,需要将物种分布转移到较冷的息地.
结论:
- 开发的框架提供了高分辨率的预测生态社区在温度上升和压力因素,如缺氧的影响.
- 适应效应对物种的持久性比以前被认为的更为关键和有效.
- 预计由于气候变化引起的热应激,水生生态系统将发生重大变化.
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