Increasing morphological disparity and decreasing optimality for jaw speed and strength during the radiation of jawed vertebrates.
Increasing morphological disparity and decreasing optimality for jaw speed and strength during the radiation of jawed vertebrates.
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在有颌骨脊椎动物的辐射过程中，增加了形态差异，降低了颌骨速度和强度的最佳性。
DOI：
10.1126/sciadv.abl3644
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发表时间：
2022-03-18
期刊：
影响因子：
13.6
通讯作者：
Rayfield EJ
中科院分区：
文献类型：
--
作者：
Deakin WJ;Anderson PSL;den Boer W;Smith TJ;Hill JJ;Rücklin M;Donoghue PCJ;Rayfield EJ
志留纪-泥盆纪有颌脊椎动物的适应辐射是几乎所有现存脊椎动物生物多样性的基础，其特征是下颌的进化创新。多条证据表明，颌骨是从喙鳃弓进化而来的，但颌骨何时开始具有进食功能仍不清楚。我们量化了化石记录中最早的颌骨的各种形式，从中我们生成了一个理论形态空间，然后我们测试了功能最优性。通过绘制与真实的颌骨数据和重建颌骨形态从遗传推断的祖先，我们的研究结果表明，最早的颌骨形状优化快速关闭和应力抵抗，推断捕食性进食功能。在有颌脊椎动物的后期辐射中，颌的形状对于这些功能变得不那么理想。因此，颌骨形态的进化不断探索以前未被占用的形态空间，并随着时间的推移积累差异，为不同的进食策略和有颌脊椎动物的成功奠定了基础。最早的有颚脊椎动物的颚是为了平衡速度和力量而优化的。
The Siluro-Devonian adaptive radiation of jawed vertebrates, which underpins almost all living vertebrate biodiversity, is characterized by the evolutionary innovation of the lower jaw. Multiple lines of evidence have suggested that the jaw evolved from a rostral gill arch, but when the jaw took on a feeding function remains unclear. We quantified the variety of form in the earliest jaws in the fossil record from which we generated a theoretical morphospace that we then tested for functional optimality. By drawing comparisons with the real jaw data and reconstructed jaw morphologies from phylogenetically inferred ancestors, our results show that the earliest jaw shapes were optimized for fast closure and stress resistance, inferring a predatory feeding function. Jaw shapes became less optimal for these functions during the later radiation of jawed vertebrates. Thus, the evolution of jaw morphology has continually explored previously unoccupied morphospace and accumulated disparity through time, laying the foundation for diverse feeding strategies and the success of jawed vertebrates. Jaws of the earliest jawed vertebrates were optimized for a trade-off between speed and strength.
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