过氧适应和红鼓 (Sciaenops ocellatus) 的有氧反应
Benjamin Negrete1, Kerri Lynn Ackerly2, Madison R Schumm2
1The University of Texas Austin Marine Science Institute, Port Aransas, TX, USA; University of British Columbia, Vancouver, British Columbia, Canada.
概括
暴露于高氧 (高氧水平) 的鱼类可以急剧增加它们的有氧范围. 在红鼓鱼中,长期暴露于高氧导致微妙的生理调整,增强氧气的使用和输送.
科学领域:
- 环境生理学环境生理学
- 水生毒理学 水生毒理学
- 鱼类生物学 鱼类生物学
背景情况:
- 过氧,或氧气超和,会产生有利于水生生物的扩散梯度.
- 鱼类可能拥有利用超和氧气增加代谢功能的机制.
研究的目的:
- 调查河口红鼓 (Sciaenops ocellatus) 中慢性过氧适应的生理影响.
- 在高氧条件下评估新陈代谢率,氧气供应能力和心脏功能的变化.
主要方法:
- 红鼓被适应了正常 (100%) 或高氧 (150%) 条件三周.
- 测量了整个动物的新陈代谢率,氧气供应能力 (αo),根源效应和心脏线粒体呼吸.
- 在交叉设计中评估了新陈代谢率,包括详尽的运动挑战.
主要成果:
- 过氧的适应导致血红蛋白含量降低,甲血红蛋白降低,红细胞pH值降低.
- 在适应组之间没有观察到Root效应或心脏线粒体呼吸的显著差异.
- 整个动物的新陈代谢率没有受到适应的影响,但当鱼在高氧化状态下进行炼时,有氧范围增加了.
结论:
- 鱼类可以通过增加新陈代谢率和有氧范围而从高氧中获益.
- 慢性高氧暴露会诱导红鼓微妙的生理调整,影响氧气的运输.
- 虽然慢性适应对基线新陈代谢的影响有限,但急性过氧暴露会提高生理性能.
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