Mechanical basis of morphogenesis and convergent evolution of spiny seashells
Mechanical basis of morphogenesis and convergent evolution of spiny seashells
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DOI：
10.1073/pnas.1220443110
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发表时间：
2013-04-09
影响因子：
11.1
通讯作者：
Goriely, Alain
中科院分区：
文献类型：
--
作者：
Chirat, Regis;Moulton, Derek E.;Goriely, Alain
趋同进化是一种现象，相似的特征在亲缘关系不密切的物种中独立进化，通常被解释为功能上的。软体动物贝壳中的刺被经典地解释为反复进化，作为对粉碎贝壳的捕食者的防御。在这里，我们考虑形成这些结构的形态发生过程，并为它们的反复出现奠定基础。我们建立了一个基于分泌地幔边缘和钙化壳边缘之间的力学相互作用的脊柱形态发生的数学模型，在壳生长过程中地幔附着在钙化壳边缘上。结果表明，通过这一自然力学过程的控制参数的微小变化，可以解释脊柱结构的巨大多样性。这一物理机制表明，脊椎的收敛进化可以通过一般的形态发生过程来理解，并为理解这个动物界第二大门的表型进化提供了独特的视角。
Convergent evolution is a phenomenon whereby similar traits evolved independently in not closely related species, and is often interpreted in functional terms. Spines in mollusk seashells are classically interpreted as having repeatedly evolved as a defense in response to shell-crushing predators. Here we consider the morphogenetic process that shapes these structures and underlies their repeated emergence. We develop a mathematical model for spine morphogenesis based on the mechanical interaction between the secreting mantle edge and the calcified shell edge to which the mantle adheres during shell growth. It is demonstrated that a large diversity of spine structures can be accounted for through small variations in control parameters of this natural mechanical process. This physical mechanism suggests that convergent evolution of spines can be understood through a generic morphogenetic process, and provides unique perspectives in understanding the phenotypic evolution of this second largest phylum in the animal kingdom.