最早的 nektonic 脊椎动物中的三角翼设计
Héctor Botella1, Richard A Fariña2, Francisco Huera-Huarte3
1Unidad de Paleobiología y Biología Teórica. Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universitat de Valencia, Valencia, Spain.
Communications biology
|September 16, 2024
概括
早期的脊椎动物游泳者,无的Pteraspidiformes,使用它们的刚性头盔通过前沿旋产生升力,使水柱殖民成为可能. 这种水力动力学机制使它们能够在4亿多年前的海底环境中壮成长.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 水力动力学是指水力动力学.
背景情况:
- pelagic领域的脊椎动物殖民是一个关键的进化过渡.
- 传统上归因于脊椎动物,早期活跃的游泳者很可能是像Pteraspidiformes这样的无"皮动物".
- 这些早期鱼类的提升和稳定机制仍然不清楚,因为它们缺乏传统的控制表面.
研究的目的:
- 研究使脊椎动物早期殖民水柱的水力动力学机制.
- 为了确定Pteraspidiformes的刚性头部盾牌是如何产生提升和稳定的.
- 评估Pteraspidiformes在海底和谷底条件下的表现.
主要方法:
- 在水道中的粒子图像速度测量 (PIV).
- 在真实尺寸的Pteraspidiformes模型上进行力测量.
- 模拟地面效应的实验,以比较海底和盆地性能.
主要成果:
- Pteraspidiformes的刚性头皮盾产生显著的水力动力提升,类似于三角洲翅膀.
- 流量模型显示了前沿的 vortex 形成,增强提升和延迟机.
- 与盆地情景相比,Pteraspidiformes在模拟的海上条件下表现出优越的水力动力性能.
结论:
- 由头皮盾产生的前沿旋对于Pteraspidiformes殖民水柱至关重要.
- 这种水力动力学机制使早期脊椎动物能够在4亿多年前利用海底环境.
- 这些发现挑战了关于水生脊椎动物运动进化的传统观点.
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