Anatomy and histochemistry of spread-wing posture inbirds. 4. Eagles soar with fast, not slow muscle fibres.
Anatomy and histochemistry of spread-wing posture inbirds. 4. Eagles soar with fast, not slow muscle fibres.
复制标题
鸟类展翅姿势的解剖学和组织化学。
DOI：
10.1111/azo.12125
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
McFarland,JoshuaC
中科院分区：
文献类型：
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作者：
Meyers,RonA;McFarland,JoshuaC
Slow fibres are typically characterized as functioning in avian postural behaviours such as soaring flight and are described for a number of elite soarers such as vultures, pelicans and albatrosses. Golden Eagles and Bald Eagles also display soaring behaviour, and we examined their flight muscles for the presence of slow fibres. Surprisingly, eagles lack a deep layer to the pectoralis found in other soaring species. Additionally, the pectoralis as well as other shoulder muscles had few to no slow muscle fibres. The lack of functionally meaningful numbers of slow muscle fibres in eagle flight muscles indicates that they must rely on fast fibres for posture; these can function in that role due to their high aerobic capacity and also perhaps a ‘tuning’ of muscle contraction frequency to function more efficiently at isometric contractions.
