多变种进化过程中的间歇性与渐进性转变:对子的配对辐射的测试
Natasha Stepanova1,2, James D Boyko1, Jada Lin1
1Department of Ecology and Evolutionary Biology, University of Michigan, 1105 North University Ave., Biological Sciences Building, Ann Arbor, MI 48109, USA.
Systematic biology
|January 17, 2025
概括
在澳大利亚和马达加斯加之间对特征的进化变化进行了比较. 尽管外表相似,但Ctenotus属显示出独特的进化模式,表明特征相关性的快速变化.
科学领域:
- 进化生物学是进化的生物学.
- 比较解剖学的比较解剖学.
- 宏观进化的动态.
背景情况:
- 随着时间的推移,积累突变的血统可以改变宏观进化轨迹.
- 现象类平行性,即不同的血统发展出相似的特征,在澳大利亚和马达加斯加的scincid中很常见.
研究的目的:
- 为了比较澳大利亚和马达加斯加scincid的表型进化动态.
- 为了测试底层的表型并行性的进化共变性结构是否在这些古老的血统中得到保护.
- 调查进化模式是否在不同的功能模块 (头骨,四肢,四肢腰带) 中是一致的.
主要方法:
- 收集了94种澳大利亚和29种马达加斯加的微型CT扫描的线性测量结果.
- 应用多变量比较方法来分析进化协差结构.
- 评估了跨功能模块和地理组的特征相关架构.
主要成果:
- 头骨进化显示,马达加斯加和大多数澳大利亚皮肤之间存在相似的共变矩阵.
- 对四肢和四肢腰带的结果是模两可的,一些子集支持不同的进化过程.
- 与所有其他研究的相比,澳大利亚属Ctenotus表现出明显的协同变异结构,这表明最近的进化转变.
结论:
- 特性相关性的架构可以在相对较短的进化时间尺度上发生显著的变化.
- 在Ctenotus的独特的进化模式可以解释其独特的形态空间位置.
- 多变量进化过程即使在地质上短时间内也会发生重大变化.
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