古代海底的棋盘: 如何形塑造了Silurian brachiopods的空间分布
1State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China.
概括
化石手足类动物表现出独特的棋盘图案,这表明它们的微小子在古代社区中积极调节了间距. 这为塑造化石社区结构的生物机制提供了罕见的证据.
科学领域:
- 古生态学 古生态学
- 古生物学的古生物学
- 进化生物学 进化生物学
背景情况:
- 了解化石社区的空间模式是古生态学的关键.
- 在化石中调节个体间距的生物机制尚不清楚.
- 脊足动物的形很少保存,特别是在坎布里亚后的化石中.
研究的目的:
- 为了研究足动物在空间组织中的功能.
- 为化石社区的活跃间距调节提供直接的古生物学证据.
- 为了分析一个特殊的 *Nucleospira calypta * 的化石组合.
主要方法:
- 多代理分析:扫描电子显微镜,X射线光,微计算机断层扫描.
- 语音学分析,以了解保存途径.
- 空间点模式分析:近邻分析,蒂森多边形.
主要成果:
- 精美的保存 setae 在 * Nucleospira calypta * 的现场化石组合中被发现.
- 保存被重新解释为随后涂层的氧化铁,而不是石.
- 确定了具有统计学意义的,非随机的,象棋盘式的个体分布.
- 个人间的间距与保存的 setae 长度相关.
结论:
- 在密集的盆地社区中,Brachiopod setae积极调解空间组织.
- 这表明,除了环境因素之外,还存在着塑造社区结构的生物机制.
- 微妙的解剖学特征可以在地质时间内对生态产生重大影响.
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