The roles of phylogeny, body size and substrate use in trabecular bone variation among Philippine ‘earthworm mice’ (Rodentia: Chrotomyini)
The roles of phylogeny, body size and substrate use in trabecular bone variation among Philippine ‘earthworm mice’ (Rodentia: Chrotomyini)
复制标题
系统发育、体型和基质使用在菲律宾“蚯蚓小鼠”骨小梁变异中的作用（啮齿目：Chrotomyini）
DOI：
10.1093/biolinnean/blad033
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发表时间：
2023
影响因子：
1.9
通讯作者：
Heaney, Lawrence R
中科院分区：
文献类型：
--
作者：
Smith, Stephanie M;Rowsey, Dakota M;Nations, Jonathan A;Angielczyk, Kenneth D;Heaney, Lawrence R
松质骨在动物的整个生命过程中都是根据其力学环境进行建模的，但与其他骨骼解剖学一样，它也受到进化的影响。然而，影响骨小梁结构的因素的相对强度研究很少。我们调查了这些影响菲律宾特有的鼠类啮齿动物分支Chromomyini。这些哺乳动物已经建立了牢固的系统发育关系，表现出一系列有据可查的基质使用类型，并具有跨越数百克的体型范围，使其成为对骨小梁形态的外在和内在影响进行易于处理的研究的理想选择。我们发现不同基质使用类别之间的椎骨骨小梁略有差异，在更生态专业化的类群中具有更趋不同的特征。这表明，机械环境必须是相对极端的影响小哺乳动物的骨小梁形态。我们还恢复了异速生长模式，这意味着选择性骨压力可能不同的小型和大型哺乳动物。最后，我们发现高intraaxonomic变化的骨小梁形态，但它是不是明确相关的任何变量，我们测量，并可能代表一个正常程度的变化，在这些动物，而不是一个功能性状。未来的研究应该解决这种可塑性如何影响骨骼的生物力学特性和性能。
Trabecular bone is modelled throughout an animal’s life in response to its mechanical environment, but like other skeletal anatomy, it is also subject to evolutionary influences. Yet the relative strengths of factors that affect trabecular bone architecture are little studied. We investigated these influences across the Philippine endemic murine rodent clade Chrotomyini. These mammals have robustly established phylogenetic relationships, exhibit a range of well-documented substrate-use types, and have a body size range spanning several hundred grammes, making them ideal for a tractable study of extrinsic and intrinsic influences on trabecular bone morphology. We found slight differences in vertebral trabecular bone among different substrate-use categories, with more divergent characteristics in more ecologically specialized taxa. This suggests that the mechanical environment must be relatively extreme to affect trabecular bone morphology in small mammals. We also recovered allometric patterns that imply that selective pressures on bone may differ between small and large mammals. Finally, we found high intrataxonomic variation in trabecular bone morphology, but it is not clearly related to any variable we measured, and may represent a normal degree of variation in these animals rather than a functional trait. Future studies should address how this plasticity affects biomechanical properties and performance of the skeleton.