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《科学》 第393卷 第6808期 · 2026年7月16日 · 中文解读

哺乳动物牙齿性能权衡揭示剪切与压碎的根本二分法

Performance trade-offs define a fundamental dental dichotomy in mammals · N. Chatar et al.
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这篇讲什么
一项研究通过三维几何形态测量和机械性能测试,揭示了哺乳动物裂齿在剪切与压碎功能之间存在根本性权衡,并影响其宏观进化。
原文开头
Narimane Chatar1,2*, Melvin Vankelst3, Alejandro Pérez-Ramos2, Tahlia I. Pollock4,5, Davide Tamagnini6, Margot Michaud3,7,8, Levi Yoder Raskin9, Z. Jack Tseng1 Teeth define mammalian evolution, and one of many adaptive dental breakthroughs in crown mammals is the tribosphenic molar: a tooth with a dual shearing-crushing function, often considered a key adaptation in crown mammals. However, we do not know how potential trade-offs between these antagonistic functions may influence the macroevolutionary outcomes of mammalian lineages. Here, we show that predatory mammals evolved dichotomized performance in their tribosphenic carnassial teeth, with slicing constrained to a narrow set of optimal phenotypes and crushing exhibiting redundant solutions. less than 1% of predators evolved optimized shearing and crushing. …
摘自《科学》(Science)第393卷 第6808期 · 2026年7月16日,N. Chatar et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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