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证据表明,随着鱼类物种体质的增加,对急性变暖的耐受性下降
Théo P Navarro1, Davide Thambithurai1,2, Emma Duquenne-Delobel1
1UMR MARBEC - Université de Montpellier, CNRS, IFREMER, IRD, INRAE, 34250 Palavas-les-Flots, France.
The Journal of experimental biology
|September 15, 2025
概括
由于氧气供应的限制,较大的鱼类对热应激更为敏感. 这项研究表明,随着鱼体质量的增加,热能耐受性下降,在热浪期间影响鱼群.
科学领域:
- 环境生理学环境生理学
- 水生生态学 水生生态学
- 鱼类生物学 鱼类生物学
背景情况:
- 较大的鱼类可能对有氧代谢的氧气吸收能力有限,可能会增加热敏度.
- 了解尺寸依赖的热耐受性对于预测鱼群对气候变化的反应至关重要.
研究的目的:
- 为了研究不同鱼群体体质量和急性变暖耐受性之间的关系.
- 为了确定氧气吸收的限制是否解释了观察到的与质量相关的热耐受性下降.
主要方法:
- 测试了四种鱼种群 (欧洲海,尼罗河,金头海) 在广泛的体重范围 (20-800g).
- 使用游泳的临界热最大值 (CTSmax) 协议评估热耐受性.
- 在疲劳之前测量的大质量特定的最大氧气吸收率 (O2,最大热量).
主要成果:
- 通过CTSmax测量的急性变暖耐受性,在所有人群中随着体重增加而显著下降.
- 质量特定的最大氧气吸收率 (O2,max-热量) 也随质量显著下降,与CTSmax相关.
- 心肺呼吸能力并不能完全解释较大个体的热耐受性降低.
结论:
- 与较小的同类相比,较大的鱼类对急性热应激的耐受性较低.
- 这种与质量相关的变暖耐受性下降背后的确切机制需要进一步研究.
- 研究结果表明,面对全球气温和热浪的上升,这可能会对鱼类种群结构产生潜在影响.
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