作为对耐力跑的人工选择的反应,胸的模块化适应
Elizabeth Webb1, Jesse Hennekam2,3, Nicole E Schwartz4
1Department of Earth and Environmental Sciences, University of Manchester, Manchester, UK.
Anatomical record (Hoboken, N.J. : 2007)
|January 22, 2026
概括
在小鼠中为跑步的人工选择揭示了胸的适应,特别是在尾部肋骨中. 这表明跑步的多种进化解决方案,影响肋骨数量和形状变化.
科学领域:
- 进化生物学是进化的生物学.
- 比较解剖学的比较解剖学.
- 生物力学 生物力学
背景情况:
- 持续跑步是哺乳动物的一个关键适应,涉及复杂的解剖和生理变化.
- 胸腔在呼吸和运动中的作用至关重要,但它在跑步中的特殊适应性仍未得到充分研究.
- 研究野生种群的适应性很困难,需要人工选择等替代模型.
研究的目的:
- 通过人工选择在小鼠中研究胸适应持续跑步的情况.
- 测试跑步行为和胸形态之间的形式-功能关系.
- 探索如何选择运行影响胸模式,形状和模块化.
主要方法:
- 利用人工选择,创造出具有增强自发车轮运行行为的高跑者 (HR) 老鼠.
- 使用肋骨计数和3D几何形态测量,比较HR小鼠和对照小鼠之间的肋骨配置和形状.
- 分析了肋骨数量,真肋骨与假肋骨的比例,以及胸形状的变化.
主要成果:
- 在四条HR线中,有两条呈现出额外的肋骨,表明由于选择而改变了肋骨的图案.
- 没有观察到HR和对照小鼠之间整体肋骨形状的显著差异.
- 显著的适应效应局限于尾部肋骨,在HR小鼠中显示出更大的差异和整合.
结论:
- 跑步行为的选择以模块化方式影响哺乳动物胸适应,主要影响尾部肋骨.
- 肋骨中的适应涉及选择压力和尾结合之间的复杂相互作用.
- 运行适应可以表现为多个解剖层面的变异性,包括肋骨数,形状和模块化,为进化挑战提供"多个解决方案".
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