一个前类恐龙的生命史中的发育可塑性
P Martin Sander1, Nicole Klein
1Institut für Paläontologie, Universität Bonn, Nussallee 8, D-53115 Bonn, Germany. martin.sander@uni-bonn.de
Science (New York, N.Y.)
|December 17, 2005
概括
早期的恐龙Plateosaurus engelhardti表现出多样化的生命史,与生长受到环境因素的影响,类似于爬行动物. 组织学揭示了这种常见的前类动物的生长标记和身体大小之间的不一致的相关性.
科学领域:
- 古生物学的古生物学
- 脊椎动物生物学 脊椎动物生物学
- 中生代生态系统 中生代生态系统
背景情况:
- 像Plateosaurus engelhardti这样的前类恐龙是最早的恐龙群体之一.
- 了解恐龙生命史对于重建过去的生态系统和进化动态至关重要.
- 化石骨的组织学分析提供了对个体生长模式和生命史策略的洞察.
研究的目的:
- 为了研究早期前类恐龙Plateosaurus engelhardti的生命史变异性.
- 为了确定骨组织学,生长速度和Plateosaurus体型之间的关系.
- 为了比较Plateosaurus的生命历史可塑性与现代爬行动物,哺乳动物,鸟类和其他恐龙.
主要方法:
- 对Plateosaurus engelhardti化石的长骨组织学分析.
- 检查纤维骨结构以评估生长速度.
- 对增长标志 (例如,LAG) 的定性和定量分析,以推断增长模式.
- 组织学特征与估计的身体大小之间的相关性分析.
主要成果:
- 普拉托索鲁斯表现出恐龙特有的快速生长率,由纤维骨证实.
- 组织学特征,包括生长停止和标记计数,与身体大小的相关性不佳.
- 单个的Plateosaurus生命史受到环境因素的显著影响.
- 这种对生命历史的环境影响与在现代外热爬行动物中看到的相似.
结论:
- 普拉特索拉斯·恩格尔哈迪 (Plateosaurus engelhardti) 具有可变的生命历史,偏离了简单的尺寸增长关系.
- 环境因素在塑造Plateosaurus的本体发生方面发挥了重要作用.
- 类动物的生命历史可塑性与外热爬行动物相匹配,而不是内热哺乳动物,鸟类或其他恐龙.
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