在十三线地松鼠 (Ictidomys tridecemlineatus) 中,生长和代谢率的动态和异步的本体遗传变化
Jessica L Li1, Katie E Marshall1, William K Milsom1
1Department of Zoology, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4.
The Journal of experimental biology
|May 15, 2025
概括
哺乳动物的新陈代谢速度与体质在发育过程中不同. 这项对十三线地松鼠的研究揭示了代谢缩放和生长中的异步变化,与发展权衡有关.
科学领域:
- 动物学 动物学
- 身体生理学 身体生理学
- 发展生物学 发展生物学
背景情况:
- 哺乳动物的新陈代谢率 (V ̇O2) 假设与新生儿的体重以同位数的方式缩放,在达到关键尺寸后过渡到低位数缩放.
- 了解这种代谢缩放开关的时间和驱动因素对于理解哺乳动物发育和能量分配至关重要.
研究的目的:
- 确定什么时候发生代谢缩放开关发生在产后发育的其他十三线地松鼠 (Ictidomys tridecemlineatus).
- 研究代谢缩放变化与发育模式,特别是生长和生理成熟之间的关系.
主要方法:
- 测量体质和休息代谢率 (V̇O2) 的十三线地松鼠幼从出生后的0天到1岁以上.
- 使用流通透气计进行精确的V·O2测量.
- 分析了生长速度和代谢缩放指数 (B) 的本体遗传变化.
主要成果:
- 产后早期的发育显示出异比代谢缩放 (B=1.01±0.03) 与持续增长.
- 代谢缩放指数 (B=2.64±0.13) 在产后18-23天之间出现了显著的,暂时的增加,这与断奶和独立发育相吻合.
- 在出生后的第29天,生长速度急剧增加,随着能量转向生长,代谢缩放指数 (B=-0.27±0.43) 减少.
结论:
- 十三线地松鼠的新陈代谢缩放表现出重复和异步的本体遗传变化,从简单的同度变化偏离到低度变化.
- 这些变化反映了在关键发育时期的生理发育和体质生长之间的动态能量分配权衡.
- 观察到的代谢模式与物种的发育轨迹密切相关,包括断奶和实现独立生活能力.
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