海平面控制在埃迪亚卡拉-坎布里亚动物辐射
Fred T Bowyer1, Rachel A Wood1, Mariana Yilales1
1School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK.
Science advances
|July 31, 2024
概括
在埃迪亚卡-坎布里亚时期的早期动物进化 (元动物辐射) 受海平面变化和海洋氧化事件的影响,尽管化石记录有偏见.
科学领域:
- 古生物学的古生物学
- 地质地质地质地质地质地
- 生物地质化学生物地质化学
背景情况:
- 早期动物多样化的原因 (埃迪亚卡兰-坎布里亚元代元动物辐射) 和化石记录的可靠性尚未得到充分理解.
- 重建过去的环境条件和生物多样性需要整合多种地质和地化学代理.
研究的目的:
- 通过分析岩石体积,生物多样性和环境代理的变化来调查埃迪亚卡拉-坎布里亚元代动物辐射的驱动因素.
- 评估海平面周期和氧化事件对早期动物进化的影响.
主要方法:
- 利用全球年龄框架 (58000-5100万年前) 估计海洋沉积岩体积,重建生物多样性 (平均属丰富度) 和采样强度.
- 综合碳酸盐碳同位素 (δ13Ccarb) 和全球氧化还原数据 (碳酸盐同位素, δ238Ucarb) 与地质数据.
- 分析了化石集合 (阿瓦隆,白海,坎布里亚) 与环境变化有关的时间分布.
主要成果:
- 采样强度与53.5亿年前之前重建的生物多样性相关.
- 全球海平面周期 (过度回归) 影响了海洋沉积岩的分布.
- 早期的甲基动物辐射与海平面上主要海平面过度发生之前的浅海氧化事件相吻合.
结论:
- 早期动物生命的化石记录是有偏见的,特别是在深海环境中.
- 尽管存在偏见,早期的甲动物辐射和海洋氧化事件显然与主要的海平面周期有关.
- 海平面的波动和氧气的可用性是控制早期动物进化在埃迪亚卡拉-坎布里亚期间的重要因素.
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