序列性特征进化并没有推动鱼的深度时间多样化
Alexis F P Marion1, Fabien L Condamine1, Guillaume Guinot1
1Institut des Sciences de l'Evolution de Montpellier (ISEM), CNRS, IRD, EPHE, Université de Montpellier, Montpellier, France.
概括
鱼的进化是顺序的,它们的祖先是沿海的,有叶酸的祖先. 与预期相反,关键特征并没有推动鱼的多样化,这表明其他因素在它们的进化历史上更有影响力.
科学领域:
- 宏观进化的生物学
- 进行比较的基因组学.
- 海洋脊椎动物的进化过程
背景情况:
- 了解特征进化及其对多样化的影响在生态学和进化中至关重要.
- 自中生代以来,鱼是重要的海洋脊椎动物,在宏观进化研究中仍未得到充分研究.
- 之前的研究还没有充分研究特征进化或其对鱼多样性模式的影响.
研究的目的:
- 为了重建鱼最广泛的时间校准,物种级别的族系.
- 编制一个关于鱼生态和生物特征的综合数据库.
- 研究特征进化及其对鱼多样化模式的影响.
主要方法:
- 一个时间校准的,物种级鱼基因结构的重建.
- 编制一个详尽的生态 (饮食,息地) 和生物 (繁殖,身体长度) 特性数据库.
- 应用进化和多样化的先进模型,包括隐藏特征分析.
主要成果:
- 支持鱼特征演变的顺序模型.
- 估计现存鱼最近的一个小到中型,乳酸性,沿海居住的共同祖先.
- 没有支持在检查的特征中依赖特征的多样化,挑战了先前的假设.
结论:
- 特定特征在塑造鱼多样化的作用可能被高估了.
- 未来的宏观进化研究应该探索鱼多样化的替代驱动因素.
- 这项研究为了解鱼的进化历史和多样化动态提供了基础.
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