在中德沃尼亚珊瑚礁上的珊瑚光合生
Jonathan Jung1, Simon F Zoppe2, Till Söte3
1Climate Geochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. jonathan.jung@mpic.de.
Nature
|October 24, 2024
概括
中期德沃尼亚珊瑚有光合作生物, 根据同位素的比例, 表明古代珊瑚礁在缺乏营养的水域中繁荣. 这种古老的珊瑚相生可能为法内罗纪最富有生长力的珊瑚礁生态系统提供了燃料.
科学领域:
- 古生物学与海洋生物学
- 生物地球化学和同位素地球化学
- 进化生物学与共生
背景情况:
- 在营养不良的热带水域,岩石珊瑚的生存依赖于与光合作用虫的共生.
- 珊瑚-藻类共生在地质时间的演化历史和流行程度尚不清楚.
- 了解过去的共生可以澄清其生态和进化作用.
研究的目的:
- 调查珊瑚藻类光合作用的进化历史.
- 为了确定中代沃尼亚珊瑚的光合作生病率.
- 为了推断德纪珊瑚礁的生态化学条件.
主要方法:
- 在珊瑚结合的有机物中分析同位素比率 (15N/14N) (CB-δ15N).
- 从中德沃尼 (Givetian) 珊瑚样本与现代珊瑚共生数据的同位素值的比较.
- 根据CB-δ15N值区分有或没有活跃光合作体的珊瑚.
主要成果:
- 殖民地表状和状状珊瑚表现出较低的CB-δ15N值 (2.51±0.97‰),表明它们是光合作体的宿主.
- 单独的和 (伪) 殖民的珊瑚显示出更高的CB-δ15N值 (5.52 ± 1.63‰),表明它们缺乏光合作体.
- 代纪珊瑚类型之间的同位素差异反映了现代的共生珊瑚和无共生珊瑚.
结论:
- 中期德沃尼珊瑚和一些状珊瑚有活跃的光合作体,而其他珊瑚则没有.
- 低的CB-δ15N值表明,纪珊瑚礁存在于低质条件下,类似于现代的亚热带旋转.
- 广泛的德时期寡可能促进了珊瑚的光合作生, 导致这些古老的珊瑚礁生态系统的高生产率.
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