伊纪巴塔哥尼亚时期的花家族的化石
V D Barreda1, L Palazzesi, M C Tellería
1Sección Paleopalinología, División Paleobotánica, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Avenida Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina. vbarreda@macn.gov.ar
Science (New York, N.Y.)
|October 9, 2010
概括
来自伊纪巴塔哥尼亚的Asteraceae (百合花家族) 化石揭示了早期的南美起源. 这些发现表明,家庭.
科学领域:
- 古植物学是古植物学.
- 帕利诺学 (Palynology) 是一个临床学科.
- 进化生物学 进化生物学
背景情况:
- 阿斯特拉家族,通常被称为百合花或向日,是全球最大和最多样化的植物家族之一.
- 了解主要植物家族的进化历史和地理起源对于重建过去的生态系统和生物多样性至关重要.
- 关于Asteraceae起源的先前假设一直在争论中,提出了不同的起源中心.
研究的目的:
- 为了研究早期的进化历史和Asteraceae家族的地理起源.
- 提供化石证据支持或反驳关于Asteraceae起源的现有假设.
- 到目前为止,关键的Asteraceae血统的分歧.
主要方法:
- 分析来自阿根廷巴塔哥尼亚的Eocene沉积物的化石capitula (花头) 和花粉粒.
- 化石标本与现存的Asteraceae种类的形态比较,特别是在Mutisioideae和Carduoideae亚家族内.
- 遗传学分析包括化石数据来推断进化关系和分歧时间.
主要成果:
- 在阿根廷南部的巴塔哥尼亚发现了埃奥森化石的capitula和Asteraceae的花粉粒.
- 这些化石显示的形态特征与现存的基底Asteraceae血统一致,如Mutisioideae和Carduoideae.
- 这些发现表明,阿斯特拉属在南美洲的存在很大,在埃奥森时代.
结论:
- 化石证据强烈支持Asteraceae家族的南美起源.
- 这些化石的世时代表明,Asteraceae在早期至中期的世时代发生了分歧.
- 在大陆碎片化和分散屏障建立之前,一个祖先的Asteraceae种群可能是南贡德瓦纳地质植物的一部分.
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