猩猩牙中的氧气同位素揭示了近期和古代气候变化
Tanya M Smith1,2, Manish Arora3, Christine Austin3
1Griffith Centre for Social and Cultural Research, Griffith University, Southport, Australia.
eLife
|March 8, 2024
概括
猩猩的牙揭示了古老的降雨模式,显示了普莱斯托纪晚期在婆罗洲的干旱条件. 这项研究验证了灵长类动物的牙作为重建过去环境的气候代理.
科学领域:
- 古气候学 古气候学
- 古生物学的古生物学
- 灵长类生态学灵长类生态学
背景情况:
- 气候变化研究经常使用自然档案中的生长层,如珊瑚,树环,冰和沉积物核心.
- 牙质中的氧同位素组成 (δ18O) 提供了一种直接的方法来重建个体动物的环境历史.
- 灵长类动物的牙,特别是猩猩的牙,被探索为高分辨率气候数据的新型档案.
研究的目的:
- 通过检查哺乳期间的同位素丰富来验证灵长类第一牙作为环境代理的使用.
- 用猩猩牙的牙质来重建婆罗洲和苏门答腊最近和古老的降雨趋势.
- 将化石猩猩的古气候数据与现代降雨模式和其他区域古气候记录进行比较.
主要方法:
- 在现代和化石猩猩 (Pongo spp.) 中分析氧气同位素成分 (δ18O). 第一个牙.第一个牙.
- 从六只现代婆罗洲和苏门答腊猩猩的十二个牙中每周分辨率分析 δ18O 值.
- 从化石猩猩牙 (普莱斯托纪晚期/全新纪早期) 的 δ18O 数据与现代数据和区域古气候记录进行比较.
主要成果:
- 在独家哺乳期间,在猩猩牙中没有观察到一致的同位素丰富,这支持它们作为代理的使用.
- 与婆罗洲人相比,现代苏门答腊猩猩表现出更一致的年度和双模式降雨模式.
- 晚期普世/早期Holocene 婆罗洲猩猩建议干燥,更开放的环境与降低季风强度与现代条件相比.
结论:
- 猩猩的牙作为可靠的档案用于重建高分辨率的过去降雨和环境条件.
- 古气候重建表明,在普莱斯托时代晚期到今天之间,婆罗洲的环境发生了重大变化.
- 这种方法有可能用于研究与东南亚早期人类迁徙相关的古老环境.
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