热最佳度在海洋外热生物的低氧耐受性:生理原因和生物地理后果
Martin-Georg A Endress1,2, Justin L Penn1,3, Thomas H Boag3
1School of Oceanography, University of Washington, Seattle, Washington, United States of America.
PLoS biology
|January 16, 2024
概括
水生动物水生动物.
科学领域:
- 环境生理学环境生理学
- 水生呼吸系统 水生呼吸系统
- 气候变化生物学
背景情况:
- 水生动物的新陈代谢率和氧气需求通常会随着温度的增加而增加.
- 临界氧值 (Pcrit) 揭示了复杂的热模式,包括最佳状态,挑战了简单的代谢缩放.
- 了解这些模式对于预测物种对海洋变暖的反应至关重要.
研究的目的:
- 研究水生动物的临界氧气值 (Pcrit) 中热最佳的流行率和生理驱动因素.
- 为了建模氧气运输动态,并确定跨温度的限制因素.
- 评估Pcrit热量最佳对物种分布的生物地理影响.
主要方法:
- 使用水生水呼吸者的动态模型分析实验和生物地理数据.
- 模拟从水到组织的氧气转移,包括温度依赖的新陈代谢,扩散,通风,循环和O2-蛋白结合.
- 检查已发表的物种呼吸系统特征和发生数据.
主要成果:
- 在Pcrit中,即使在生理速度稳步增加的情况下,也可以出现热最佳值.
- 当氧气供应受到不同温度敏感过程的限制时,在低温 (通风/循环) 和高温 (扩散) 时发生这种情况.
- 具有这些特征的物种居住在接近最佳温度的低氧水中,并且在更冷或更热的温度下受限于更高的氧气水平.
结论:
- 水生动物的低氧耐受性可以在寒冷和温暖的极端条件下受到限制,而不仅仅是高温.
- 这些发现表明,Pcrit中的热最佳值可以影响物种的极点和赤道范围的范围.
- 这项研究强调了生理学,温度和氧气供应在塑造水生生物多样性的复杂相互作用.
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