Comparative cranial biomechanics in two lizard species: impact of variation in cranial design.
Comparative cranial biomechanics in two lizard species: impact of variation in cranial design.
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DOI：
10.1242/jeb.234831
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发表时间：
2021-03-11
期刊：
影响因子：
--
通讯作者：
Fagan MJ
中科院分区：
文献类型：
--
作者：
Dutel H;Gröning F;Sharp AC;Watson PJ;Herrel A;Ross CF;Jones MEH;Evans SE;Fagan MJ
鳞龙类的颅骨形态是高度不同的，其特征是骨元素的频繁丢失或减少。在巨蜥和壁虎中，眶后杆的丧失与头骨形状的变化有关，但这种变化背后的机械原理仍然知之甚少。在这里，我们试图确定如何整体颅骨结构和存在的眶后杆与负载和变形的颅骨在利皮龙咬。使用基于计算机的模拟技术，我们比较了两种大型活跃觅食动物-尼罗巨蜥（Varanus niloticus）和夜猫子（Salvator meritrium）的颅骨生物力学。尽管尼罗弧菌的应变梯度较低，但这两个物种的颅骨整体应变大小和分布相似。In S.此外，眶后杆对于颅骨抵抗进食负荷是重要的。眶后韧带，在蜥蜴类中部分取代了眶后杆，不影响骨张力。我们的研究结果表明，减少眶后杆既不损害咬的性能，也不损害结构阻力的颅骨喂养负荷在V。尼罗。这两个物种之间的骨应变差异可能反映了摄食和非摄食功能对颅骨形状的要求。除了与物种特异性形态差异相关的颅骨应变变化之外，我们的研究结果表明，具有不同颅骨形状的蜥蜴共享类似的机械行为。与哺乳动物的情况相反，眶周区域、颅盖和腭的形态对于这些蜥蜴承受高的摄食负荷似乎是重要的。总结：在体内测量和计算机为基础的模拟两个大蜥蜴的颅骨力学表明，类似的机械行为是共享蜥蜴与不同的颅骨结构，并显示的重要性，postorbital酒吧在抵抗喂养负荷。
Cranial morphology in lepidosaurs is highly disparate and characterised by the frequent loss or reduction of bony elements. In varanids and geckos, the loss of the postorbital bar is associated with changes in skull shape, but the mechanical principles underlying this variation remain poorly understood. Here, we sought to determine how the overall cranial architecture and the presence of the postorbital bar relate to the loading and deformation of the cranial bones during biting in lepidosaurs. Using computer-based simulation techniques, we compared cranial biomechanics in the varanid Varanus niloticus and the teiid Salvator merianae, two large, active foragers. The overall strain magnitude and distribution across the cranium were similar in the two species, despite lower strain gradients in V. niloticus. In S. merianae, the postorbital bar is important for resistance of the cranium to feeding loads. The postorbital ligament, which in varanids partially replaces the postorbital bar, does not affect bone strain. Our results suggest that the reduction of the postorbital bar impaired neither biting performance nor the structural resistance of the cranium to feeding loads in V. niloticus. Differences in bone strain between the two species might reflect demands imposed by feeding and non-feeding functions on cranial shape. Beyond variation in cranial bone strain related to species-specific morphological differences, our results reveal that similar mechanical behaviour is shared by lizards with distinct cranial shapes. Contrary to the situation in mammals, the morphology of the circumorbital region, calvaria and palate appears to be important for withstanding high feeding loads in these lizards. Summary: In vivo measurements and computer-based simulations of the cranial mechanics of two large lizards indicate that similar mechanical behaviour is shared by lizards with distinct cranial architecture, and show the importance of the postorbital bar in resisting the feeding loads.
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影响因子：
1.5
作者：
FRAZZETTA, TH
通讯作者：
FRAZZETTA, TH
影响因子：
3.7
作者：
Curtis N;Jones ME;Shi J;O'Higgins P;Evans SE;Fagan MJ
通讯作者：
Fagan MJ
影响因子：
5.2
作者：
Herrel, A;Spithoven, L;De Vree, F
通讯作者：
De Vree, F
影响因子：
7.6
作者：
BEHRENTS, RG;CARLSON, DS;ABDELNOUR, T
通讯作者：
ABDELNOUR, T
DOI：
10.1098/rsif.2013.0216
发表时间：
2013-07-06
期刊：
Journal of the Royal Society, Interface
影响因子：
--
作者：
Gröning F;Jones ME;Curtis N;Herrel A;O'Higgins P;Evans SE;Fagan MJ
通讯作者：
Fagan MJ