平行和分离的形态适应是跳跃能力进化的基础
L Aibekova1, R A Keller2, J Katzke1
1Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan.
Integrative organismal biology (Oxford, England)
|August 7, 2023
概括
跳具有扩大的腿部肌肉,特别是三叉体压缩肌肉,这表明它们罕见的运动行为是主要的适应. 这些形态变化,重点是肌肉截面面积,解释了它们的跳跃能力.
科学领域:
- 进化生物学 进化生物学
- 生物力学 生物力学
- 昆虫形态学 昆虫形态学
背景情况:
- 跳跃是中罕见的运动器官专业化,对其潜在的形态适应的理解有限.
- 现有知识表明,在跨越不同属的跳跃过程中,腿部和身体部位的参与有所不同.
研究的目的:
- 为了研究跳动行为的形态适应.
- 为了比较跳跃和不跳跃的亲属之间的运动肌肉.
- 要确定跳跃是否仅仅依赖于肌肉收缩或涉及弹性反弹.
主要方法:
- 利用X射线微型CT和3D形态测量来比较肌肉结构.
- 分析了特定尺寸的肌肉体积和肌肉结构 (PCSA,纤维长度,角).
- 与身体长度相比的后腿长度的比较.
主要成果:
- 跳具有3-5倍大的三叉压缩肌肉 (scm6) 和中后腿和后腿的缩小的尾远移肌肉 (scm2).
- 跳的肌肉体积增加主要是由于更大的生理横截面积 (PCSA),而不是纤维长度.
- 在跳中,后腿比较长.
结论:
- 增加对跳跃特异性肌肉的投资是将跳跃与非跳跃分开的一个关键适应.
- 在大多数研究的物种中,直接的肌肉收缩似乎足以提高跳跃性能.
- 在中跳跃的形态适应性既是常见的,也是在各个属中具有特异性.
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