一个新的古世化石和一个新的水鸟 (Aves:Anseriformes) 数据集澄清了K-Pg边界的分类,生态进化和鸟类进化
Grace Musser1,2, Julia A Clarke2
1Department of Vertebrate Zoology, Division of Birds, The Smithsonian National Museum of Natural History, Washington, District of Columbia, United States of America.
PloS one
|July 30, 2024
概括
这项研究通过使用一种新的化石物种和形态学数据来解决水鸟 (Anseriformes) 的进化关系. 祖先的水鸟很可能是水生食草动物,为鸟类灭绝后的进化提供了洞察力.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 系统学 系统学 系统学
背景情况:
- 尽管它们的生态多样性和化石记录,但类 (水鸟) 的进化历史和生态多样化仍然不清楚.
- 存在的形态学数据集产生了相互冲突的原始遗传关系,阻碍了对白纪-古世 (K-Pg) 边界周围祖先生态和鸟类进化的理解.
研究的目的:
- 解决类动物的进化关系和生态进化.
- 确定类动物的祖先养生态,并了解跨越K-Pg大灭绝的鸟类进化.
主要方法:
- 构建一个新的,全面的形态数据集的,包括灭绝和现存的分类.
- 来自绿河形成的新早期伊欧纪安斯里形物种的分析.
- 用贝叶斯方法将形态学数据与已发表的序列结合起来进行的家系学分析.
- 对形态,生态和行为特征的祖先状态重建.
主要成果:
- 描述了一种新的Eocene早期anseriform分类体,具有独特的中侧狭窄的法案.
- 遗传学分析始终将新分类列为 (Anseranatidae+Anatidae) 的姐妹分类.
- 这种新分类代表了类动物和绿河形成动物群中的新生态.
结论:
- 这项研究为鸟类进化提供了关键的见解,特别是在K-Pg大灭绝期间和之后.
- 结果表明,类动物很可能是祖先的水生食草动物,具有形状的叶片.
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