Natural variation of magnesium isotopes in mammal bones and teeth from two South African trophic chains
Natural variation of magnesium isotopes in mammal bones and teeth from two South African trophic chains
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南非两个营养链哺乳动物骨骼和牙齿中镁同位素的自然变异
DOI：
10.1016/j.gca.2013.12.029
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发表时间：
2014
影响因子：
5
通讯作者：
V. Balter
中科院分区：
文献类型：
--
作者：
J. Martin;D. Vance;V. Balter
同位素分馏伴随着元素通过陆地生态系统的转移有可能揭示初级生产者和消费者之间的生态相互作用，但除了碳和氮，这种潜力几乎没有被利用。本文首次测定了南非克鲁格国家公园和西开普省现存哺乳动物骨骼和牙齿的镁稳定同位素组成。地质基质的性质被证明是生态系统同位素基线的主要决定因素，如WC哺乳动物的镁同位素比（范围为-1.58 ‰至-0.79 ‰）比KNP哺乳动物的镁同位素比（范围为-1.01 ‰至-0.04 ‰）轻。因此，分类群的同位素特征之间的比较必须限制在一个预定义的地理区域与均匀的基板。在这两个公园，镁显示轻微富集在较重的同位素从食草动物到食肉动物。植物仍然被困在齿系的食草动物提供直接证据的饮食来源，并在可用时，进行了测量。仅在KNP中，植物遗骸的δ 26 Mg值系统地比草食动物牙齿的δ 26 Mg值轻。这些结果邀请进一步探索镁同位素在脊椎动物生态系统中的变异性，以测试镁，生物必需元素中存在的相对较大的比例在骨骼和牙齿磷灰石，可能作为一个额外的营养示踪氮，这是一个组成部分的胶原蛋白，埋葬后迅速降解。
Isotopic fractionations accompanying element transfer through terrestrial ecosystems have the potential to shed light on ecological interactions between primary producers and consumers, but with the exception of carbon and nitrogen this potential has barely been exploited. Here, the magnesium stable isotope composition of bones and teeth of extant mammals from Kruger National Park (KNP) and Western Cape (WC), South Africa was measured for the first time. The nature of the geological substrate proves to be a major determinant of the ecosystem isotope baseline, as indicated by the lighter magnesium isotope ratios measured in WC mammals (ranging from −1.58‰ to −0.79‰) compared to those from KNP mammals (ranging from −1.01‰ to −0.04‰). Therefore, comparisons between the isotope signatures of taxa must be restricted to a pre-defined geographic area with a homogeneous substrate. In both parks, Mg shows slight enrichment in heavier isotopes from herbivores to carnivores. Plant remains trapped in the dentition of herbivores provide direct evidence of dietary source and, when available, were measured. In KNP only, δ26Mg of plant remains is systematically lighter than the values for herbivore teeth. These results invite further exploration of the variability of Mg isotopes in vertebrate ecosystems in order to test whether magnesium, a bio-essential element present in relatively large proportions in bone and teeth apatite, may serve as an additional trophic tracer to nitrogen, which is a constituent of collagen that rapidly degrades after burial.
影响因子：
3.9
作者：
E. Tipper;E. Lemarchand;R. Hindshaw;B. Reynolds;B. Bourdon
通讯作者：
E. Tipper;E. Lemarchand;R. Hindshaw;B. Reynolds;B. Bourdon
影响因子：
3.5
作者：
Foster, G. L.;Pogge von Strandmann, P. A. E.;Rae, J. W. B.
通讯作者：
Rae, J. W. B.