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首页> 外文期刊>Evolution: International Journal of Organic Evolution >Shape-shift: Semicircular canal morphology responds to selective breeding for increased locomotor activity
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Shape-shift: Semicircular canal morphology responds to selective breeding for increased locomotor activity

机译：变形：半规管形态响应选择性繁殖，运动能力增强

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摘要

Variation in semicircular canal morphology correlates with locomotor agility among species of mammals. An experimental evolutionary mouse model was used to test the hypotheses that semicircular canal morphology (1) evolves in response to selective breeding for increased locomotor activity, (2) exhibits phenotypic plasticity in response to early-onset chronic exercise, and (3) is unique in individuals possessing the minimuscle phenotype. We examined responses in canal morphology to prolonged wheel access and selection in laboratory mice from four replicate lines bred for high voluntary wheel-running (HR) and four nonselected control (C) lines. Linear measurements and a suite of 3D landmarks were obtained from 3D reconstructions of mu CT-scanned mouse crania (mu CT is microcomputed tomography). Body mass was smaller in HR than C mice and was a significant predictor of both radius of curvature and 3D canal shape. Controlling for body mass, radius of curvature did not differ statistically between HR and C mice, but semicircular canal shape did. Neither chronic wheel access nor minimuscle affected radius of curvature or canal shape These findings suggest that semicircular canal morphology is responsive to evolutionary changes in locomotor behavior, but the pattern of response is potentially different in small-versus large-bodied species.
机译：半圆形管形态的变化与哺乳动物物种之间的运动敏捷性有关。实验性进化小鼠模型用于测试以下假设：半圆形管形态（1）响应于选择性繁殖而发展，以增强运动能力;（2）表现出对早期发作的慢性运动的表型可塑性;（3）独特在具有小肌肉表型的个体中。我们在实验室小鼠中检查了运河形态对延长轮的进入和选择的反应，这些老鼠来自为高自愿性轮运行（HR）和四个非选择的对照（C）繁殖的四个复制品系。线性测量和3D地标套件是通过对mu CT扫描的小鼠颅骨进行3D重建而获得的（mu CT是微型计算机断层扫描）。 HR中的体重小于C小鼠，并且是曲率半径和3D管形的重要预测指标。控制体重的曲率半径在HR和C小鼠之间无统计学差异，但半圆形管形却有统计学差异。长期接触车轮和小肌肉均不会影响曲率半径或管形。这些发现表明，半圆形管形态对运动行为的进化变化有反应，但在反应型中，小到大体物种可能有所不同。

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