Metabolic rates potentially regulate the pace of important physiological and life-history traits. Natural selection has shaped the evolution of metabolic rates and the physiology that supports them, including digestibility and the rate of food consumption. Understanding the relationship between metabolic rates and energy internalization is central to understanding how resources are allocated among competing physiological functions. We investigated how artificial selection on mass-independent basal metabolic rate (BMR) and mass-independent aerobic maximal metabolic rate (MMR) affected food consumption and apparent digestibility in mice. Evolved changes in mass-corrected BMR-but not mass-corrected MMR-corresponded with changes in food consumption. This result is consistent with previous work showing that BMR constitutes a large portion of an animal's daily energy budget and thus that BMR might provide a better indicator of daily food requirements than MMR. In contrast, digestive efficiencies did not differ among selection treatments and did not evolve in these mice. This study provides insights into how evolution of metabolic rates may affect food consumption and overall energy use.

中文翻译：

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质量独立的最大代谢率选择对食物消耗的影响。

代谢率可能会调节重要的生理和生活史特征的步伐。自然选择决定了新陈代谢率和支持它们的生理机能的演变，包括消化率和食物消耗率。了解代谢率与能量内在化之间的关系对于了解如何在竞争的生理功能之间分配资源至关重要。我们调查了质量独立的基础代谢率（BMR）和质量独立的有氧最大代谢率（MMR）的人工选择如何影响食物的消耗和小鼠的表观消化率。质量校正的BMR（而非质量校正的MMR）的变化与食物消耗的变化相对应。该结果与先前的研究结果一致，后者表明BMR构成了动物每日能量预算的很大一部分，因此BMR可能比MMR提供更好的每日食物需求指标。相反，选择处理之间的消化效率没有差异，并且在这些小鼠中没有进化。这项研究提供了关于新陈代谢率的演变如何影响食物消耗和总能量消耗的见解。