在肯尼亚最后的冰川时期,草食动物迁徙有限
Kaedan O'Brien1,2,3, Katya Podkovyroff4, Diego P Fernandez5
1Department of Anthropology, University of Utah, Salt Lake City, UT, USA. kaedan.obrien@anthro.utah.edu.
Nature ecology & evolution
|May 27, 2024
概括
东非的史前哺乳动物,包括现代的和斑马,在最后的冰川时期没有迁徙. 这表明这些物种的迁徙行为在以后出现或在过去受到限制.
科学领域:
- 古生态学 古生态学
- 古生物学的古生物学
- 同位素地球化学 同位素地球化学
背景情况:
- 东非是地球上最大的陆地迁徙的东道主,但它们的进化历史仍然不太清楚.
- 牙面膜中的稳定同位素 (87Sr/86Sr) 提供了一种重建过去哺乳动物迁移模式的方法.
研究的目的:
- 为了研究古代和哺乳动物迁徙的进化历史在东非在最后一个冰川时期 (115-11.7 ka).
- 用同位素分析来描述肯尼亚的史前迁徙系统.
主要方法:
- 来自肯尼亚四个地区的79只牛和马的牙面膜中分析了稳定的同位素 (87Sr/86Sr).
- 从已灭绝和现存物种的同位素数据进行比较,以确定在最后一个冰川时期的迁徙行为.
主要成果:
- 16种物种,包括现存的蓝色,森,平原斑马,在最后一个冰川时期没有迁徙的证据.
- 只有两个已经灭绝的物种,Rusingoryx atopocranion和Megalotragus sp,表现出迁徙行为.
- 现代迁徙物种要么在全新纪发展了这种行为,要么在过去更受限制的移动.
结论:
- 在最后一个冰川时期,东非的哺乳动物迁徙系统与今天的模式有很大的不同.
- 这些发现挑战了关于生态系统动态和史前东非大哺乳动物行为的先前假设.
- 这项研究强调了东非哺乳动物群落在地质时间尺度上的结构和功能上的重大变化.
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