The role of mural mechanics on cephalopod palaeoecology

The role of mural mechanics on cephalopod palaeoecology
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壁画力学对头足类古生态学的作用

DOI:
10.1098/rsif.2020.0009
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发表时间:
2020
影响因子:
3.9
通讯作者:
Zaslansky
Zaslansky
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Lemanis;Zlotnikov;Zaslansky

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头足类动物将软体动物的外壳转变为浮力装置,其强度必须足以抵抗外部水压。从历史上看,贝壳的独特特征是根据贝壳的强度对最大栖息地深度提出硬性限制来解释的。其中一个特征是壁瓣,它是沉积在某些胶体隔膜内表面上的半棱柱形层,有人建议它可以强化贝壳并允许在更深的水域中殖民。我们通过构建有限元模型来测试这一假设,该模型显示了壁画修改如何影响壳体对静水压力的响应。发现壁画瓣没有显着的结构功能。这里发现的另一个壁画修改是适应性脊瓣,最初似乎具有将峰值应力从隔膜的附着部位移开的潜在功能;然而,这一特征的不规则分布使任何功能解释都受到质疑。箭石和十臂石的生态分离可能不是由壁画瓣的存在/不存在介导的。这项工作说明了一个潜在的警告,即并非所有独特的间隔特征都是随着静水压力的增加和更深的栖息地而形成的。
Cephalopods transformed the molluscan shell into a buoyancy device that must be strong enough to resist external water pressure. Historically, unique features of the shell have been interpreted on the basis that the strength of the shell presents a hard limit on maximum habitat depth. One such feature is the mural flap, which is a semi-prismatic layer deposited on the inner surface of some coleoid septa that has been suggested to strengthen the shell and permit colonization of deeper waters. We test this hypothesis by constructing finite-element models that show how mural modifications affect the response of the shell to hydrostatic pressure. The mural flaps are found to have no notable structural function. Another mural modification discovered here is the adapical ridge flap that initially seemed to have a potential function in shifting peak stress away from the attachment site of the septum; however, the irregular distribution of this feature casts any functional interpretation in doubt. Ecological separation of belemnites and decabrachians is likely not mediated by the presence/absence of mural flaps. This work illustrates a potential caveat that not all unique septal features formed in response to increasing hydrostatic pressure and deeper habitats.
比较头足动物的壳强度和隔膜形态在应力分布中的作用。
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期刊: PeerJ
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DOI: 10.1017/s0025315400023948
发表时间: 1961-01-01
影响因子: 1.2
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