Stable Nitrogen Isotope Analysis of Dentine Serial Sections Elucidate Sex Differences in Weaning Patterns of Wild Chimpanzees ( Pan troglodytes)
Stable Nitrogen Isotope Analysis of Dentine Serial Sections Elucidate Sex Differences in Weaning Patterns of Wild Chimpanzees ( Pan troglodytes)
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DOI：
10.1002/ajpa.22464
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发表时间：
2014-04-01
影响因子：
2.8
通讯作者：
Boesch, Christophe
中科院分区：
文献类型：
--
作者：
Fahy, Geraldine E.;Richards, Michael P.;Boesch, Christophe
繁殖后代是雌性哺乳动物繁殖过程中最需要精力的方面之一。哺乳期长度和断奶策略的变化黑猩猩（Pan troglodytes），我们最近的生活亲戚，和现代人类社会之间的报道。这些变化发生的时间和原因经常被讨论。我们的研究使用稳定的氮同位素数据的牙根牙本质从野生西方黑猩猩（黑猩猩verus）在泰国家公园，科特迪瓦，量化断奶在这些黑猩猩，并探讨婴儿的性别在母亲的投资中发挥作用。我们分析了乳牙侧切牙根牙本质的连续切片从四个泰黑猩猩建立N-15信号的哺乳婴儿，然后我们分析了连续切片的第一恒下颌磨牙根牙本质从12个泰黑猩猩提供定量N-15数据在这个人口中断奶。直到2岁，两性都表现出牙本质N-15值比成年雌性泰黑猩猩高出约2-3个千分之一，与哺乳信号一致。此后，可观察到N-15值稳定降低，与断奶开始和进展一致。性别差异也很明显，与雌性动物相比，雄性动物的N-15值下降速度明显较慢。证实了泰黑猩猩之间的母亲投资的性别差异，证明了使用同位素分析来研究非人灵长类动物断奶的可行性。此外，假设在泰黑猩猩中观察到的行为说明了祖先的模式，我们的研究结果提供了一个平台，使人类进化中的断奶轨迹得到进一步探索。美国物理人类学杂志153：635-642，2014年。(c)2013 Wiley Periodicals，Inc.
Offspring provisioning is one of the most energetically demanding aspects of reproduction for female mammals. Variation in lactation length and weaning strategies between chimpanzees (Pan troglodytes), our closest living relative, and modern human societies have been reported. When and why these changes occurred is frequently debated. Our study used stable nitrogen isotope data of tooth root dentine from wild Western chimpanzees (Pan troglodytes verus) in Tai National Park, Cote d'Ivoire, to quantify weaning in these chimpanzees and explore if infant sex plays a role in maternal investment. We analyzed serial sections of deciduous lateral incisor root dentine from four Tai chimpanzees to establish the N-15 signal of nursing infants; we then analyzed serial sections of first permanent mandibular molar root dentine from 12 Tai chimpanzees to provide quantitative N-15 data on weaning in this population. Up to 2 years of age both sexes exhibited dentine N-15 values approximate to 2-3 parts per thousand higher than adult female Tai chimpanzees, consistent with a nursing signal. Thereafter a steady decrease in N-15 values consistent with the onset, and progression, of weaning, was visible. Sex differences were also evident, where male N-15 values decreased at a significantly slower rate compared to females. Confirmation of sex differences in maternal investment among Tai chimpanzees, demonstrates the viability of using isotope analysis to investigate weaning in non-human primates. Additionally, assuming that behaviors observed in the Tai chimpanzees are illustrative of the ancestral pattern, our results provide a platform to enable the trajectory of weaning in human evolution to be further explored. Am J Phys Anthropol 153:635-642, 2014. (c) 2013 Wiley Periodicals, Inc.