补充氧气不会改善生长,但可以提高鱼类的生殖能力
Michael R Skeeles1, Hanna Scheuffele1, Timothy D Clark1
1School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3216, Australia.
Proceedings. Biological sciences
|November 1, 2023
概括
温度升高加速了鱼类的生长,但减少了成年鱼的体型,这一现象被称为温度大小规则 (TSR). 这项研究发现,虽然温暖的水和补充氧气影响了鱼类的生长和成熟,但氧气限制并不是Galaxias maculatus中TSR的主要驱动因素.
科学领域:
- 水生生态学 水生生态学
- 气候变化生物学
- 鱼类生理学 鱼类生理学
背景情况:
- 温度大小规则 (TSR) 描述了更温暖的温度如何导致鱼类的生长速度更快,但成体体积更小.
- 人们对TSR的基本机制的了解很少,氧气限制是主要假设.
- 以前的研究还没有明确地测试氧气在TSR中介作用.
研究的目的:
- 为了研究氧气限制在Galaxias maculatus的温度大小规则 (TSR) 中的作用.
- 为了确定补充氧气是否会影响鱼类的生长,成熟时间和成年人体大小在不同的温度状态下.
- 探索鱼类的氧气供应,繁殖和温度之间的关系.
主要方法:
- 年轻的Galaxias maculatus在两个温度下养了一年:15°C (当前) 和20°C (预测).
- 在每个温度组内,鱼类暴露于正常的氧气水平 (normxia) 或高氧水平 (hyperoxia).
- 监测了生长速度,性成熟年龄,成年人体大小和生殖窗口.
主要成果:
- 在较温暖 (20°C) 处理的鱼类表现出更快的生长和更早的性成熟,与TSR一致.
- 补充氧气 (过氧) 增加了最大的氧气摄取量,但没有改变性成熟时的平均体型或最终成年人体型.
- 过氧症显著延长了生殖窗口,无论温度和鱼的尺寸如何.
结论:
- 氧气限制不是Galaxias maculatus温度大小规则 (TSR) 的主要原因.
- 虽然氧气的可用性会影响生殖时间,但它似乎不会直接控制在变暖条件下达到的身体尺寸.
- 强烈的生殖投资可能会造成氧气瓶,这表明生殖,氧气和鱼类生理中的温度之间的复杂相互作用.
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