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一只热敏的歌鸟患致命高温症的风险随着湿度的增加而增加
Nazley Liddle1,2,3, Marc T Freeman1,2, Susan J Cunningham3
1South African Research Chair in Conservation Physiology, South African National Biodiversity Institute, Pretoria, South Africa.
Biology letters
|October 15, 2025
概括
在热浪期间,高湿度显著增加了蓝花的致命高温症风险. 这一发现表明,未来的气候变化可能会使南非地区与热量相关的鸟类死亡风险增加三倍.
科学领域:
- 环境科学 环境科学
- 鸟类生物学 鸟类生物学
- 气候变化研究 气候变化研究
背景情况:
- 热浪的频率和强度增加导致鸟类大规模死亡事件.
- 高湿度对鸟类热应激的具体影响尚不清楚.
研究的目的:
- 量化湿度对蓝 (Uraeginthus angolensis) 致命高温症风险的影响.
- 评估预计的世纪末湿度水平对鸟类死亡率的潜在影响.
主要方法:
- 在干燥和潮湿的条件下测量了蓝虫的体温,代谢热量产生和蒸发热量损失.
- 暴露在接近或高于它们正常体温的空气温度下的鸟类.
- 模拟的未来湿度对高温症风险的影响.
主要成果:
- 潮湿的空气显著降低了蓝色球的蒸发式冷却能力.
- 在潮湿条件下 (45.7°C) 与干燥条件下 (47.9°C) 的最大可容忍空气温度降低了~2°C.
- 预计本世纪末的湿度水平可能会使南非致命高温症的风险增加三至七倍.
结论:
- 升高的湿度加剧了蓝色虫的致命高温症风险.
- 气候变化引起的湿度增加对鸟类种群构成重大威胁,特别是在像非洲南部这样的地区.
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