身体大小和温度会影响鱼类的代谢和心脏热耐受性
Krista Kraskura1, Emily A Hardison2, Erika J Eliason2
1Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA. k.kraskura@gmail.com.
Scientific reports
|October 19, 2023
概括
较大的鱼类表现出更大的心脏热耐受性,尽管环境变暖. 这项研究揭示了影响鱼类对气候变化反应的尺寸特定生理约束,影响渔业预测.
科学领域:
- 生理生态生态学生理生态学
- 气候变化生物学
- 湿热体生理学 湿热体生理学
背景情况:
- 环境变暖与更小的热体型有关,这表明更大的个体可能更容易受到气候变化的影响.
- 了解尺寸特异性温度脆弱性背后的机制对于预测渔业生产率和社区结构转变至关重要.
- 研究了一种欧热鱼 - - 条形冲浪鱼,以调查对不同体型的不同温度的代谢和心脏反应.
研究的目的:
- 探索代谢和心脏机制驱动体型脆弱性,以温度在禁止冲浪.
- 为了确定温度如何影响新陈代谢率 (MMR,RMR) 和心脏热容忍度 (fHmax) 在不同尺寸的带条冲浪上.
- 为了评估较大的鱼类是否比较小的鱼类更容易受到热应激.
主要方法:
- 带条冲浪 (5-700克) 暴露在四个生态相关的温度 (16°C,12°C,20°C,22°C) 中.
- 测量了代谢能力,包括绝对和因数有氧范围 (AAS,FAS),最大代谢率 (MMR) 和休息代谢率 (RMR).
- 通过在急性温度升高期间测量最大心率 (fHmax) 来估计心脏热耐受性.
主要成果:
- 代谢速率 (MMR和RMR) 在所有测试温度中都表现出低度缩放 (指数0.81).
- 最大心率 (fHmax) 在不同温度下显示较弱的低度缩放 (指数 -0.05).
- 与预测相反,有氧能力在不同大小和温度下保持稳定,较大的鱼类表现出增强的心脏热耐受性.
结论:
- 热性能限制因动物的大小和物种而异.
- 较大的条形冲浪比较小的个体具有更大的心脏热耐受性.
- 这些发现挑战了对外热生物普遍大小特异性易受变暖影响的假设,并要求改进气候变化影响模型.
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