新的化石暗示现代鸟类在中生代的更深的起源
Shaoyuan Wu1,2,3, Ziqi Tao1,4, Liang Liu5
1Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Sciences, Jiangsu Normal University, Xuzhou 221116, China.
National science review
|July 14, 2025
概括
宏观进化力量,就像大规模灭绝一样,塑造了生命的历史. 新证据表明,现代鸟类 (Aves) 在白纪-古生物学期灭绝之前变得多样化,这挑战了以前的理论.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 基因组学就是基因组学.
背景情况:
- 宏观进化的力量,包括大规模灭绝,已经显著改变了主要生物群体的进化轨迹.
- 6600万年前的白纪-古纪 (K/Pg) 灭绝事件造成了广泛的物种丧失,但允许许多血统生存.
- 现代鸟类 (皇冠群Aves) 的进化起源和多样化时间受到争议,许多人认为是灭绝后的辐射.
研究的目的:
- 审查和综合用于确定鸟类多样化时间的方法.
- 评估导致鸟类分歧时间估计差异的因素.
- 整合古生物学和遗传学数据,以了解早期的鸟类进化.
主要方法:
- 对包括50个至300多个全基因组在内的基因组数据集的分析,以推断分歧时间.
- 评估从罗纪晚期和白纪晚期的新化石发现.
- 综合来自多个学科的证据来重建进化历史.
主要成果:
- 遗传学研究为鸟类谱系提供了分歧时间的估计.
- 罗纪晚期和白纪晚期的化石发现为早期鸟类进化提供了洞察力.
- 古生物学证据越来越多地支持许多现存的鸟类血统的白纪起源.
结论:
- 鸟类顺序多样化的主要爆发可能发生在K/Pg边界之前.
- 这种多样化恰逢白时期的基精子陆地革命,以及其他群体的辐射,如开花植物和哺乳动物.
- 这些发现挑战了鸟类多样化主要发生在K/Pg灭绝事件之后的观点.
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