Decoupled evolution of the cranium and mandible in carnivoran mammals

Decoupled evolution of the cranium and mandible in carnivoran mammals
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食肉动物颅骨和下颌骨的解耦进化

DOI:
10.1111/evo.14578
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发表时间:
2022
期刊:
影响因子:
3.3
通讯作者:
Santana, Sharlene E.
Santana, Sharlene E.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Law, Chris J.;Blackwell, Emily A.;Curtis, Abigail A.;Dickinson, Edwin;Hartstone‐Rose, Adam;Santana, Sharlene E.

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头骨形态和饮食之间的关系是适应性进化的一个最好的例子。在哺乳动物中,头骨由头盖骨和下颌骨组成。虽然预计下颌骨的演变更直接地响应饮食的变化,饮食制度可能对颅骨的影响较小,因为额外的感觉和脑保护功能可能会对其形态演变施加限制。在这里,我们通过比较100多种具有不同进食生态的食肉哺乳动物的颅骨和下颌骨形状和大小的进化模式来验证这一假设。我们的研究结果表明,在颅骨和下颌骨的形状解耦的进化模式;颅骨的形状如下分支为基础的进化转变,而下颌骨的形状进化与广泛的饮食制度。这些结果是一致的,与以前的假设,在食肉动物的等级形态进化和更大的进化不稳定性的下颌骨相对于饮食。此外,在超食肉动物,颅骨和下颌骨大小的演变与相对猎物的大小。这表明,饮食多样性可以松散的结构由颅下颌骨的大小在一些行业。我们的研究结果表明,哺乳动物头骨形态的演变是由饮食适应以外的机制。
The relationship between skull morphology and diet is a prime example of adaptive evolution. In mammals, the skull consists of the cranium and the mandible. Although the mandible is expected to evolve more directly in response to dietary changes, dietary regimes may have less influence on the cranium because additional sensory and brain-protection functions may impose constraints on its morphological evolution. Here, we tested this hypothesis by comparing the evolutionary patterns of cranium and mandible shape and size across 100+ species of carnivoran mammals with distinct feeding ecologies. Our results show decoupled modes of evolution in cranial and mandibular shape; cranial shape follows clade-based evolutionary shifts, whereas mandibular shape evolution is linked to broad dietary regimes. These results are consistent with previous hypotheses regarding hierarchical morphological evolution in carnivorans and greater evolutionary lability of the mandible with respect to diet. Furthermore, in hypercarnivores, the evolution of both cranial and mandibular size is associated with relative prey size. This demonstrates that dietary diversity can be loosely structured by craniomandibular size within some guilds. Our results suggest that mammal skull morphological evolution is shaped by mechanisms beyond dietary adaptation alone.
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