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首页> 外文期刊>Journal of Avian Biology >Variation in the mechanical properties of flight feathers of the blackcap Sylvia atricapilla in relation to migration
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Variation in the mechanical properties of flight feathers of the blackcap Sylvia atricapilla in relation to migration

机译：黑帽SSylvia atricapilla的飞行羽毛的机械性能与迁移的变化

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摘要

Migration causes temporal and energetic constraints during plumage development, which can compromise feather structure and function. In turn, given the importance of a good quality of flight feathers in migratory movements, selection may have favoured the synthesis of feathers with better mechanical properties than expected from a feather production constrained by migration necessities. However, no study has assessed whether migratory behaviour affects the relationship between the mechanical properties of feathers and their structural characteristics. We analysed bending stiffness (a feather mechanical property which is relevant to birds' flight), rachis width and mass (two main determinants of variation in bending stiffness) of wing and tail feathers in migratory and sedentary blackcaps Sylvia atricapilla. Migratory blackcaps produced feathers with a narrower rachis in both wing and tail, but their feathers were not significantly lighter; in addition, bending stiffness was higher in migratory blackcaps than in sedentary blackcaps. Such unexpected result for bending stiffness remained when we statistically controlled for individual variation in rachis width and feather mass, which suggests the existence of specific mechanisms that help migratory blackcaps to improve the mechanical behaviour of their feathers under migration constraints.
机译：迁移在羽毛发育过程中引起时间和精力上的限制，可能会损害羽毛的结构和功能。反过来，鉴于高质量的飞行羽毛在迁徙运动中的重要性，选择可能更倾向于合成具有比因迁移需要而受限制的羽毛生产所期望的机械性能更好的机械性能的羽毛。但是，没有研究评估迁移行为是否会影响羽毛的机械特性与其结构特征之间的关系。我们分析了迁徙的和久坐的黑capSylvia atricapilla的翼羽和尾羽的弯曲刚度（与鸟类的飞行有关的羽毛力学性能），拉奇宽度和质量（弯曲刚度变化的两个主要决定因素）。迁徙的黑cap产生的羽毛在机翼和尾巴上都有较窄的羽轴，但它们的羽毛并不明显变浅。此外，迁徙黑帽的弯曲刚度高于久坐黑帽。当我们统计地控制轴的宽度和羽毛质量的个体变化时，弯曲刚度的这种出乎意料的结果仍然存在，这表明存在帮助迁移黑black改善其在迁移约束下的羽毛机械性能的特定机制。

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