DOI: 10.1016/j.epsl.2018.09.026
Scopus记录号: 2-s2.0-85054466440
论文题名: Calcium isotopes in enamel of modern and Plio-Pleistocene East African mammals
作者: Martin J.E. ; Tacail T. ; Cerling T.E. ; Balter V.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503 起始页码: 227
结束页码: 235
语种: 英语
英文关键词: calcium
; diagenesis
; fossil mammals
; stable isotopes
; trophic ecology
Scopus关键词: Calcium
; Carbon
; Ecosystems
; Enamels
; Mammals
; Sedimentology
; Tooth enamel
; Calcium isotopes
; diagenesis
; Isotopic composition
; Plio-pleistocene
; Preservation potential
; Stable isotopes
; Terrestrial ecosystems
; Trophic chains
; Isotopes
; calcium
; diagenesis
; enamel
; fossil
; isotopic composition
; mammal
; Pliocene-Pleistocene boundary
; stable isotope
; trophic conditions
; Kenya
; Mammalia
; Vertebrata
英文摘要: Calcium isotope analyses show a depletion of heavy calcium isotopes in vertebrates, compared to food sources along each trophic step. Recent studies show considerable variability of the calcium isotopic composition of bone and teeth in modern mammals, leading to inconclusive interpretations regarding the utility of Ca isotopes for trophic inference in mammal-dominated terrestrial ecosystems. Here, we analyzed modern enamel samples from the Tsavo National Park (Kenya), and fossil enamel samples dated from ca. 4 Ma to 1.6 Ma from the Turkana Basin (Kenya). We found a constancy of taxa ordering between the modern and fossil datasets, suggesting that the diagenesis of calcium isotopes is minimal in fossils. In modern herbivore samples using similar digestive physiologies, browsers are enriched in 44Ca compared to grazers. Both grazer and browser herbivore tooth enamel is enriched in 44Ca relative to carnivores by about +0.30‰. Used together, carbon and calcium isotope compositions may help refine the structure of the C3 and C4 trophic chains in the fossil record. Due to their high preservation potential, combining both carbon and calcium isotope systems represent a reliable approach to the reconstruction of the structure of past ecosystems. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109622
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Laboratoire de Géologie de Lyon: Terre, Planète, Environnement, UMR CNRS 5276 (CNRS, ENS, Université Lyon1), Ecole Normale Supérieure de Lyon, Lyon cedex 07, 69364, France; Department of Geology and Geophysics, Department of Biology, University of Utah, Salt Lake City, UT 84112, United States
Recommended Citation:
Martin J.E.,Tacail T.,Cerling T.E.,et al. Calcium isotopes in enamel of modern and Plio-Pleistocene East African mammals[J]. Earth and Planetary Science Letters,2018-01-01,503