Ontogenetic Scaling of the Humerus in Sea Turtles and Its Implications for Locomotion
Ontogenetic Scaling of the Humerus in Sea Turtles and Its Implications for Locomotion
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DOI：
10.2108/zsj.30.211
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
H. Nishizawa;M. Asahara;N. Kamezaki
中科院分区：
文献类型：
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作者：
H. Nishizawa;M. Asahara;N. Kamezaki
本研究分析了绿色海龟（Chelonia mydas）和红海龟（Caretta caretta）肱骨的个体发育比例。绿色龟的肱骨比红海龟相对较厚，这表明绿色龟的肱骨可以承受更大的负荷。我们的研究结果是一致的等距，或略负异速生长，在这两个物种的肱骨长度的直径。几何相似性或等距肱骨的体重是支持的横截面属性的估计绿色海龟。海龟适应水生生活，但也进行陆地运动。因此，在陆地运动，这需要支持对重力，所观察到的缩放关系表明，可能有更大的压力和骨折的风险，对肱骨的较大的绿色海龟比肱骨较小的海龟。在水生栖息地，其中四肢主要用于推进，应力和骨折的风险，绿色龟肱骨估计会增加更大的速度。这种缩放模式可能与较小的海龟以相对较快的单位体长速度游泳的可能性有关。
In the present study, we analyzed the ontogenetic scaling of humeri in the green turtle (Chelonia mydas) and loggerhead turtle (Caretta caretta). Green turtles have relatively thicker humeri than loggerhead turtles, indicating that the humerus of the green turtle can resist greater loads. Our results are consistent with isometry, or slightly negative allometry, of diameter in relation to length of the humerus in both species. Geometric similarity or isometry of the humerus in relation to body mass is supported by estimates of the cross-sectional properties of green turtles. Sea turtles are adapted for aquatic life, but also perform terrestrial locomotion. Thus, during terrestrial locomotion, which requires support against gravity, the observed scaling relationships indicate that there may be greater stress and fracture risk on the humeri of larger green turtles than on the humeri of smaller turtles. In aquatic habitats, in which limbs are mainly used for propulsion, the stress and fracture risk for green turtle humeri are estimated to increase with greater speed. This scaling pattern may be related to the possibility that smaller turtles swim at a relatively faster speed per body length.