Calcium isotope ratios in animal and human bone
Calcium isotope ratios in animal and human bone
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DOI：
10.1016/j.gca.2010.04.002
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发表时间：
2010-07
影响因子：
5
通讯作者：
Linda M. Reynard;G. Henderson;R. Hedges
中科院分区：
文献类型：
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作者：
Linda M. Reynard;G. Henderson;R. Hedges
组织中的钙同位素被认为受到个人饮食的影响，反映了营养水平和乳制品消费等参数，但这还没有得到仔细评估。本文报道了216例现代和考古动物及人骨的钙同位素比值（δ44/42 Ca）。同一地点饲养的现代绵羊的δ44/42 Ca值，雌性比雄性高0.14±0.08‰，这是母羊泌乳的结果。在考古骨骼样本中，食草动物群的钙同位素比率因地点而异。在一个单一的网站，考古动物群没有显示出营养水平的影响。人类的δ44/42 Ca值比平均值低0.22±0.22‰，人类的δ44/42 Ca值比动物的δ44/42 Ca值大。未发现性别或年龄对钙同位素比值的影响，个体内骨骼δ44/42 Ca变异性可忽略不计。我们排除了乳制品消费是人类δ44/42 Ca较低的主要原因，基于动物驯化和乳制品可用性之前的研究结果，并建议个人生理和钙摄入量在确定骨钙同位素比值方面可能很重要。
Calcium isotopes in tissues are thought to be influenced by an individual’s diet, reflecting parameters such as trophic level and dairy consumption, but this has not been carefully assessed. We report the calcium isotope ratios (δ44/42Ca) of modern and archaeological animal and human bone (n=216). Modern sheep raised at the same location show 0.14±0.08‰ higher δ44/42Ca in females than in males, which we attribute to lactation by the ewes. In the archaeological bone samples the calcium isotope ratios of the herbivorous fauna vary by location. At a single site, the archaeological fauna do not show a trophic level effect. Humans have lower δ44/42Ca than the mean site fauna by 0.22±0.22‰, and the humans have a greater δ44/42Ca range than the animals. No effect of sex or age on the calcium isotope ratios was found, and intra-individual skeletal δ44/42Ca variability is negligible. We rule out dairy consumption as the main cause of the lower human δ44/42Ca, based on results from sites pre-dating animal domestication and dairy availability, and suggest instead that individual physiology and calcium intake may be important in determining bone calcium isotope ratios.