Hydrogen and oxygen isotope ratios in body water and hair: modeling isotope dynamics in nonhuman primates.
Hydrogen and oxygen isotope ratios in body water and hair: modeling isotope dynamics in nonhuman primates.
复制标题
身体水和头发中的氢和氧同位素比率：模拟非人类灵长类动物的同位素动力学。
DOI：
10.1002/ajp.22019
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发表时间：
2012
影响因子：
2.4
通讯作者：
Ehleringer,JamesR
中科院分区：
文献类型：
--
作者：
O'Grady,ShannonP;Valenzuela,LucianoO;Remien,ChristopherH;Enright,LindseyE;Jorgensen,MatthewJ;Kaplan,JayR;Wagner,JaniceD;Cerling,ThureE;Ehleringer,JamesR
饮用水、饮食和大气氧的稳定同位素组成影响着体内水的同位素组成（2 H/1H，18 O/16 O，以δ 2 H和δ 18 O表示）。反过来，身体水分会影响组织中有机物质的同位素组成，如头发和牙齿，这些组织通常用于重建动物和人类的历史饮食和运动模式。在这里，我们使用了一个非人灵长类动物系统（食蟹猴）来测试两个不同的机械稳定同位素模型的鲁棒性：一个模型来预测身体水的δ 2 H和δ 18 O值，第二个模型来预测头发的δ 2 H和δ 18 O值。与以前的人类研究相比，使用非人灵长类动物喂食控制饮食使我们能够进一步限制模型参数值并评估模型预测。这两个模型可靠地预测了身体水和头发的δ 2 H和δ 18 O值。此外，同位素数据使我们能够更好地量化模型中两个关键变量的值：肠道水的δ 2 H和δ 18 O值以及与肠道中羰基氧-水相互作用相关的18 O同位素分馏（αow）。我们的建模工作表明，更好的预测身体水和头发的同位素值，实现了通过使肠道水的同位素组成接近的身体水。此外，α ow的值为1.0164，与之前唯一测量的其他观察结果（微生物孢子细胞壁）密切一致，表明该分馏因子在不同生物系统中具有稳健性。Am. J. Primatol. 74：651-660，2012.© 2012 Wiley Periodicals，Inc.
The stable isotopic composition of drinking water, diet, and atmospheric oxygen influence the isotopic composition of body water (2H/1H,18O/16O expressed as δ2H and δ18O). In turn, body water influences the isotopic composition of organic matter in tissues, such as hair and teeth, which are often used to reconstruct historical dietary and movement patterns of animals and humans. Here, we used a nonhuman primate system (Macaca fascicularis) to test the robustness of two different mechanistic stable isotope models: a model to predict the δ2H and δ18O values of body water and a second model to predict the δ2H and δ18O values of hair. In contrast to previous human‐based studies, use of nonhuman primates fed controlled diets allowed us to further constrain model parameter values and evaluate model predictions. Both models reliably predicted the δ2H and δ18O values of body water and of hair. Moreover, the isotope data allowed us to better quantify values for two critical variables in the models: the δ2H and δ18O values of gut water and the18O isotope fractionation associated with a carbonyl oxygen–water interaction in the gut (αow). Our modeling efforts indicated that better predictions for body water and hair isotope values were achieved by making the isotopic composition of gut water approached that of body water. Additionally, the value of αowwas 1.0164, in close agreement with the only other previously measured observation (microbial spore cell walls), suggesting robustness of this fractionation factor across different biological systems. Am. J. Primatol. 74:651–660, 2012. © 2012 Wiley Periodicals, Inc.