Suchian Feeding Success at the Interface of Ontogeny and Macroevolution.
Suchian Feeding Success at the Interface of Ontogeny and Macroevolution.
复制标题
DOI：
10.1093/icb/icw041
复制
发表时间：
2016-09
影响因子：
2.6
通讯作者：
O'Brien H
中科院分区：
文献类型：
--
作者：
Gignac P;O'Brien H
有许多人试图解释鳄鱼咬合力的表现是如何与颅形和饮食相关的。然而，到目前为止，鳄鱼颌骨的力学和形态与它们的性能和进化数据仍然不一致。例如，在很大程度上，人们认为成年人的功能解剖和表现非常适合成年人的利基环境。与这一观点不同的是，具有资源依赖型生长的群体，他们的幼体阶段经历了质量、形态和资源使用的变化，以克服与体型较小的问题有关的强烈选择，与成年人相比。鳄鱼就是这样一个群体的例子。作为活着的这种生物，它们也有着漫长而富含化石的进化史，其特征是身体大小相似地增加，轮齿形式多样化，以及饮食的变化。在这里，我们使用生物力学和进化建模技术来研究食器的发展和进化，并正式评估潜在的个体发育-进化平行对分支动力学的影响。我们发现个体发育和进化咬合力变化的模式表现出反转的异时性模式，这表明早期的个体发育趋势在新丝虫内被确立为宏观进化模式，早于真丝虫的起源。尽管选择可以作用于任何生命历史阶段，但我们的发现表明，尤其是对新生儿和青少年的选择，可以促进重要的功能形态，帮助个体和支系的成功，而不是强烈地与他们的成年利基联系在一起。
There have been a number of attempts to explain how crocodylian bite-force performance covaries with cranial form and diet. However, the mechanics and morphologies of crocodylian jaws have thus far remained incongruent with data on their performance and evolution. For example, it is largely assumed that the functional anatomy and performance of adults tightly fits the adult niche. At odds with this precept are groups with resource-dependent growth, whose juvenile stages undergo shifts in mass, morphology, and resource usage to overcome strong selection related to issues of small body size, as compared to adults. Crocodylians are an example of such a group. As living suchians, they also have a long and fossil-rich evolutionary history, characterized by analogous increases in body size, diversifications in rostrodental form, and shifts in diet. Here we use biomechanical and evolutionary modeling techniques to study the development and evolution of the suchian feeding apparatus and to formally assess the impact of potential ontogenetic-evolutionary parallels on clade dynamics. We show that patterns of ontogenetic and evolutionary bite-force changes exhibit inverted patterns of heterochrony, indicating that early ontogenetic trends are established as macroevolutionary patterns within Neosuchia, prior to the origin of Eusuchia. Although selection can act on any life-history stage, our findings suggest that selection on neonates and juveniles, in particular, can contribute to functionally important morphologies that aid individual and clade success without being strongly tied to their adult niche.