在变暖下较小的身体尺寸并不是由于冷水鱼的 gill-oxygen限制
Joshua K Lonthair1,2, Nicholas C Wegner3, Brian S Cheng1
1Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA 01003-9285, USA.
The Journal of experimental biology
|February 21, 2024
概括
气候变暖减少了鱼类的大小,但上氧气限制 (GOL) 假设并没有得到普遍支持. 布鲁克鱼的实验表明,GOL不太可能是水生生态外热生物中温度诱导的体型变化的唯一驱动因素.
科学领域:
- 水生生态学 水生生态学
- 气候变化生物学 气候变化生物学
- 渔业 科学 渔业 科学
背景情况:
- 人为气候变暖与水生生态热体的体型减小有关,影响渔业和生态系统.
- 状氧气限制 (GOL) 假设提出了氧气供应限制作为这种尺寸缩小的机制.
- GOL假设已被用于气候变化影响模型,但缺乏强大的实证测试.
研究的目的:
- 在鱼 (Salvelinus fontinalis) 中实证测试上氧气限制 (GOL) 假设.
- 量化温度升高对鱼生长,代谢率和表面积的影响.
- 评估GOL作为温度诱导的体型变化的通用解释的有效性.
主要方法:
- 一个长期实验,将溪鱼暴露在不同的温度 (15°C和20°C) 中.
- 增长的量化,休息代谢率 (RMR),最大代谢率 (MMR) 和表面积 (GSA).
- 关于GSA与RMR和MMR相关的所有米倾斜率的分析.
主要成果:
- 布鲁克鱼在高温下表现出减少的生长和身体尺寸.
- 甲表面积的全米斜率并不支持GOL的预测.
- 温度对代谢率的影响是时间依赖的,突出了适应的重要性.
- 氧气限制不太可能是温度与身体大小关系的普遍机制.
结论:
- 状氧气限制 (GOL) 假设不太可能是气候变化导致水生热生物体积减少的普遍解释.
- 未来的研究应该探索驱动温度与身体大小关系的替代机制.
- 基于GOL的渔业气候变化影响模型应谨慎解释,因为经验支持有限.
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