在Dromiciops gliroides的能源预算限制之间共同调节的可塑性:祖先内热学的模型
Isidora Camus1, Roberto F Nespolo1,2,3,4, Zbyszek Boratyński5
1Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile.
The Journal of experimental biology
|February 20, 2026
概括
代谢率 (BMR和VO2max) 显示灵活性,而不仅仅是遗传联系,在一个古老的有袋动物. 这表明早期的哺乳动物使用了依赖条件的特征集成来实现能量战略.
科学领域:
- 生理生态生态学 生理生态学
- 进化生物学 进化生物学
- 比较生理学比较生理学
背景情况:
- 代谢率对于生物体的能量分配,生长,繁殖和生存至关重要.
- 代谢极限,包括基底 (BMR) 和最大 (VO2max) 率,定义一个人的生理能力和能量权衡.
- 了解这些代谢特征的共变是进化和生态研究的关键.
研究的目的:
- 为了研究基底代谢率 (BMR) 和最大氧气消耗 (VO2max) 之间的共同表达模式,在一个代表古代有袋动物血统的物种中.
- 要确定BMR和VO2max之间的共变是否主要由遗传因素 (个人之间) 或环境/生理可塑性 (个人内部) 驱动.
- 探索对内热和哺乳动物生理学的演变的影响.
主要方法:
- 将BMR和VO2max之间的共变分解为个人之间和个人内部的组件.
- 研究了一种代表古代有袋动物血统的物种的这些新陈代谢速率,被认为具有假设的形哺乳动物生理学.
- 在个人中分析了VO2max和瘦肉量之间的相关性.
主要成果:
- 在个人之间发现BMR和VO2max之间的近零相关性,这表明有限的遗传共变异或权衡.
- 观察到个体内BMR和VO2max之间的实质性正相关性,表明塑性共表达是对环境变化的反应.
- 证实了VO2max和个体体质量之间的正相关性,突出了生物能量可塑性的作用.
结论:
- 在早期的类进化过程中,内热的策略可能得到了灵活的,条件依赖的特征集成的支持,而不是仅仅是固定的遗传合.
- 在新陈代谢率调节中的生理可塑性可能是哺乳动物早期进化的基本属性.
- 这些发现挑战了有氧模型对内热体进化的严格预测,强调了表型灵活性的作用.
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