The adaptations for a particular locomotor type (e.g., fossorial or saltatorial) could affect limb bone morphology throughout ontogeny. We explore how the measurements of the forelimbs and functional indices change along the postnatal ontogeny of 92 specimens of sigmodontines belonging to four genera ( Akodon , Eligmodontia , Oligoryzomys , and Oxymycterus ) with different locomotor types (ambulatory, quadrupedal-saltatorial, scansorial, and semifossorial). We examined individuals of different age categories: juveniles, young adults, and adults. Eleven linear measurements of long bones (humerus, radius, and ulna) corresponding to functional diameters and lengths were taken and analyzed through simple regressions (RMA) using geometric mean transformations. Six morphofunctional indices were then calculated and analyzed through multivariate analysis (MANOVA). The allometric patterns and morphofunctional indices show that the forelimb tends to be elongated and slender in the ambulatory, scansorial, and quadrupedal-saltatorial species, and short and thicker in the semifossorial species. Morphofunctional indices do not separate our sample concerning age categories, possibly indicating that the juveniles of different rodent species are born with similar morphology to the adults in terms of locomotion.

中文翻译：

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Sigmodontine啮齿动物（啮齿动物：Cricetidae）前肢长骨的功能指标和出生后个体发育

对特定运动类型（例如，化石或跳跃）的适应可能会影响整个个体发育过程中的肢体骨骼形态。我们探讨了 92 个 Sigmodontines 标本的前肢和功能指标的测量如何随着属于四个属（Akodon 、 Eligmodontia 、 Oligoryzomys 和 Oxymycterus ）的不同运动类型（行走、四足-saltatorial、 ）。我们检查了不同年龄段的人：青少年、年轻人和成年人。对与功能直径和长度相对应的长骨（肱骨、桡骨和尺骨）进行了 11 次线性测量，并使用几何平均变换通过简单回归 (RMA) 进行分析。然后通过多元分析（MANOVA）计算和分析六个形态功能指数。异速生长模式和形态功能指数表明，移动、扫描和四足 - saltatorial 物种的前肢趋于拉长和细长，而半窝物种的前肢短而粗。形态功能指数不能将我们的样本与年龄类别分开，这可能表明不同啮齿动物物种的幼体出生时在运动方面与成体具有相似的形态。