尽管有塑性,但热浪对于珊瑚礁鱼来说是昂贵的
Jacey C Van Wert1, Kim Birnie-Gauvin2,3, Jordan Gallagher2
1Department of Ecology, Evolution & Marine Biology, University of California, Santa Barbara, CA, 93106, USA. jcvanwert@gmail.com.
Scientific reports
|June 10, 2024
概括
海洋热浪增加了热带鱼的能源成本,影响了它们的日常活动. 这些鱼表现出心脏可塑性,但仍保持在热极限附近,冒着生态系统角色的风险.
科学领域:
- 海洋生物学 海洋生物学
- 气候变化科学 气候变化科学
- 生理生态生态学 生理生态学
背景情况:
- 由于气候变化,极端天气事件,如海洋热浪,正在加剧.
- 适应狭窄温度范围的热带水生动物特别容易受到海洋热浪的影响.
- 不适应气候的海洋生物可能会因为海面温度升高而表现出行为障碍和体能减弱.
研究的目的:
- 研究海洋热浪条件对热带眼鱼 (Paracirrhites arcatus) 的性能和耐热性的影响.
- 评估鱼对海面温度升高的生理反应的季节性变化.
- 了解气候变化引起的气候变暖对热带鱼类的潜在能量和健康后果.
主要方法:
- 在法国波利尼西亚的穆雷亚进行了两季的实地研究.
- 眼鱼暴露在模拟的海洋热浪条件下.
- 测量关键的生理参数,包括日常活动的能量成本,有氧能力和心脏功能 (最大心率).
主要成果:
- 海洋热浪条件显著增加了鱼的日常活动的能量成本,例如突发游泳恢复和消化.
- 尽管暴露在更高的温度下,有氧能力保持不变.
- 鱼表现出心脏可塑性,增加最大心率,但运行接近其热极限.
结论:
- 与海洋热浪相关的能源成本上升可能会迫使像眼鱼这样的热带鱼改变其活动优先级.
- 虽然表现出一些生理可塑性,但鱼在接近其耐热极限的情况下运行,这表明它们容易受到热浪强度和频率的增加.
- 如果不能快速适应海洋热浪,可能会导致生理后果,破坏热带鱼类的生态作用.
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