简短的沟通:对灵长类哺乳和断奶的基本模型进行了重新审视
Tanya M Smith1,2, Manish Arora3, Maya Bharatiya1,2
1Griffith Centre for Social and Cultural Research, Griffith University, AUSTRALIA.
American journal of biological anthropology
|July 5, 2023
概括
巴牙中的 (Ba) 和 (Sr) 微量元素揭示了哺乳行为. 含量准确地表明断奶年龄,而质在质的图案需要进一步调查可靠的护理史推断.
科学领域:
- 古人类学古人类学.
- 生物考古学的生物考古学
- 灵长类生态学灵长类生态学
背景情况:
- 牙中的微量元素 (Ba) 和 (Sr) 用于重建人类和非人类灵长类动物的哺乳和断奶历史.
- 之前的研究已经在化石人种中使用了这些元素代理物,包括澳大利亚人猿和尼安德特人.
研究的目的:
- 为了对比与 (Ba/Ca) 和与 (Sr/Ca) 的比例在第一 (M1s) 中的实用性,以推断野生的哺乳史.
- 探索基本假设的基本模型重建灵长类的断奶年龄.
主要方法:
- 激光切除-诱导合等离子体质谱法 (LA-ICP-MS) 用于在四只野生的M1面膜和牙中以高分辨率 (35微米) 地图化Ba/Ca和Sr/Ca.
- 在已知的发育阶段和行为观察方面分析了基本数据.
主要成果:
- 产后的Ba/Ca值在0.5岁左右达到峰值,然后下降,最低值在1.2-1.8岁之间,与观察到的哺乳期停止保持一致.
- 乳Sr/Ca没有明显的分泌区分,牙Sr/Ca的增加始于大约0.3岁,峰值年龄不同,没有明显的断奶后下降.
- 在牙中,元素变异比牙 enamel 更明显,这可能是由于矿化速度更快,以及对口腔环境的保护.
结论:
- 在M1s中,与 (Ba/Ca) 的最小值提供了比与 (Sr/Ca) 的最大值更可靠的断年龄指标.
- 仅基于质Sr/Ca模式的护理历史的重建可能需要重新评估.
- 需要进一步的研究,以了解断奶后形成的牙中高的Ba/Ca和Sr/Ca值.
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