Journal of Trace Elements in Medicine and Biology ( IF 3.6 ) Pub Date : 2020-07-16 , DOI: 10.1016/j.jtemb.2020.126622 Elke Wenting 1 , Henk Siepel 1 , Patrick A Jansen 2
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Background
The elemental composition of the mammalian body is widely believed to be more or less constant within and among species, yet reliable comparisons of elemental content are lacking. Here, we examine the elemental composition of two mammal species with different diet and provenance: terrestrial herbivorous Fallow deer (Dama dama) - collected from a single area - and semi-aquatic carnivorous Eurasian otter (Lutra lutra) - collected from different areas.
Methods
We compared twelve elemental contents for twelve different body tissues and organs, for four tissue samples per species. Homogeneous samples were tested for twelve elemental contents using ICP-OES.
Results
We found evidence for differences in elemental composition between species, between tissues, and between individuals. Herbivorous Fallow deer seemed more variable in its elemental composition compared to carnivorous Eurasian otter. The absolute concentration of some elements, e.g. Mn and Cu, showed differences between the species as well.
Conclusion
Since we found stoichiometric variation among the species, these findings question the widely held assumption that mammals are under relative tight stoichiometrically homeostatic control.
中文翻译：
陆生食草动物和半水生食肉哺乳动物内部和之间的化学计量变化。
背景
人们普遍认为哺乳动物身体的元素组成在物种内部和物种之间或多或少是恒定的，但缺乏对元素含量的可靠比较。在这里，我们检查了两种具有不同饮食和来源的哺乳动物物种的元素组成：陆生草食性小鹿 ( Dama dama ) - 从单个区域收集 - 和半水生食肉欧亚水獭 ( Lutra lutra ) - 从不同区域收集。
方法
我们比较了 12 种不同身体组织和器官的 12 种元素含量，每个物种的 4 个组织样本。使用 ICP-OES 测试均质样品的 12 种元素含量。
结果
我们发现了物种之间、组织之间和个体之间元素组成差异的证据。与肉食性欧亚水獭相比，草食性小鹿的元素组成似乎更具可变性。某些元素（例如Mn 和Cu）的绝对浓度也显示出物种之间的差异。
结论
由于我们发现了物种之间的化学计量差异，因此这些发现质疑了普遍认为哺乳动物处于相对严格的化学计量稳态控制之下的假设。
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