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在红鼓的发育过程中慢性缺氧的影响

Benjamin Negrete^1,2, Kerri Lynn Ackerly¹, Andrew J Esbaugh¹

¹Marine Science Institute, The University of Texas at Austin, Port Aransas, TX 78373, USA.

The Journal of experimental biology

|August 2, 2024

概括

红鼓鱼在生命早期暴露于低氧会导致其呼吸和代谢功能的持久变化,影响其以后在不同氧气条件下表现的能力.

科学领域:

环境生理学环境生理学
水生生物学水生生物学
发育生物学发展生物学

背景情况:

呼吸系统的可塑性是鱼类已知的适应慢性缺氧.
墨西哥湾的红鼓 (Sciaenops ocellatus) 经常遇到缺氧条件.
早期发育性缺氧暴露对红鼓生理学的影响尚不清楚.

研究的目的:

为了研究胚胎缺氧暴露的长期生理后果,红色鼓.
评估发育性缺氧对青少年红色鼓的游泳表现和有氧新陈代谢的影响.

主要方法:

红鼓胚胎在受精后的3天内暴露于低氧 (40%的空气和度) 或正常氧 (100%的空气和度).
幼虫在大约3个月的时间里在正常的条件下养.
游泳表现 (临界游泳速度,Ucrit),氧气消耗,临界氧气值 (Pcrit) 和线粒体呼吸被测量使用交叉设计在游泳道在normoxic和低氧条件下.

主要成果:

发育性缺氧暴露导致了更高的有氧范围,最大代谢率,并提高了肝脏线粒体效率.
与对照群相比,暴露于缺氧的鱼类表现出更高的缺氧敏感性 (更高的Pcrit),并与对照群相比,以较低的速度冲动游泳.
在受精后3天,在两组之间没有观察到生存或体型的显著差异.

结论:

早期的低氧暴露会导致红色鼓的复杂,持久的生理变化.
这些适应包括改变的新陈代谢率和游泳表现,这表明增强的有氧能力和增加的缺氧敏感性之间的权衡.
这些发现突出了早期环境条件在塑造鱼类在可变水生环境中的弹性和性能方面的关键作用.

关键词:

代谢率是指新陈代谢的速度.氧气氧气是一种现型性可塑性现型性可塑性呼吸系统生理学呼吸系统生理学游泳表现表现游泳表现表现

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