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一个大的有氧范围和复杂的调节能力赋予幼虫鱼,Opsanus beta,在广泛的热范围内的低氧耐受性

LeeAnn Frank¹, Joseph Serafy², Martin Grosell¹

¹Department of Marine Biology and Ecology, Rosenstiel School of Marine, Atmospheric, and Earth Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA.

The Science of the total environment

|July 15, 2023

概括

幼虫鱼 (Opsanus beta) 对温度和缺氧具有显著的耐受性,这对于他们在动态的佛罗里达湾环境中生存至关重要. 它们的生理策略允许它们在每天的氧气波动中壮成长.

科学领域:

海洋生物学海洋生物学
环境生理学环境生理学
鱼类生态鱼类生态学

背景情况:

对生命早期的青鱼的研究有限,特别是关于它们对环境压力因素的耐受性.
鱼生活在具有显著季节性温度变化和日常低氧事件的环境中.

研究的目的:

在一系列的环境温度下研究幼虫和幼鱼 (Opsanus beta) 的氧气需求和低氧耐受性.
为了比较幼虫和幼鱼对缺氧的生理反应,并将这些发现与它们的自然息地条件联系起来.

主要方法:

在23-33°C的温度下对养殖的Opsanus beta幼虫和幼虫进行了受控实验.
在渐进性缺氧下评估氧气消耗,代谢抑郁和有氧范围.
使用p50生理特征 (在50%代谢率下氧气张力) 定义和测量缺氧耐受性.
与佛罗里达湾的长期 (2014-2021) 环境温度和氧气数据相关联的实验p50值.

主要成果:

幼虫鱼在经过测试的温度下表现出广泛的有氧作用域.
幼虫在缺氧期间表现出早期代谢抑郁和低调节指数 (RI),而幼虫的调节更好,但有氧范围较低.
幼虫和幼虫都在长时间的严重缺氧中幸存下来;幼虫在缺氧后的氧气消耗较高,但由于有氧范围较高,它们的休息代谢率与幼虫相似,恢复到休息代谢率.
幼虫鱼很少经历低于p50值的情况 (11%的事件),此类事件的中位持续时间为3小时.

结论:

幼虫鱼具有生理特征,包括高有氧范围,使其能够在自然环境中通过季节性和日常低氧事件生存.
该研究提供了关于早期生命阶段面临环境变化的海洋鱼类适应策略的关键见解.
这些发现突显了Opsanus beta幼虫对温度和低氧压力的复原性,为保护和生态研究提供了信息.

关键词:

发育生理学的发展生理学.佛罗里达海湾是佛罗里达州的海湾.海洋鱼类是一种海洋鱼类.抑制新陈代谢的抑制.该法规的指数指数.O(2)2) 这样就好了.

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