Isotopic calcium biogeochemistry of MIS 5 fossil vertebrate bones: application to the study of the dietary reconstruction of Regourdou 1 Neandertal fossil

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  • Kodaira Shota
    Nagasaki City Dinosaur Museum
  • Tanaka Yu-ki
    Graduate School of Pharmaceutical Sciences, Chiba University
  • Hayashi Shoji
    Faculty of Biosphere - Geosphere Science, Okayama University of Science Division of Materials and Manufacturing Science, Graduate school of Engineering, Osaka University
  • Aoki Shogo
    Graduate School of International Resource Science, Akita University Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology
  • Hirata Takafumi
    Geochemical Research Center, The University of Tokyo
  • Ishigaki Shinobu
    Faculty of Biosphere - Geosphere Science, Okayama University of Science
  • Aoki Kazumasa
    Center for Fundamental Education, Okayama University of Science

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タイトル別名
  • Calcium Isotope and Elemental Differences between Medullary and Cortical Bones in Domestic Chicken

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<p>Female birds have a medullary bone (MB) on the innermost surface of a cortical bone (CB) during the egg-laying cycle. This bone tissue is known to store calcium (Ca) for eggshell formation. As a result of Ca isotopic analyses of MB and CB from the mature female chickens using a multiple collector-ICP-mass spectrometer (ICP-MS), the 43Ca/42Ca and 44Ca/42Ca ratios of MB were higher than those of CB in the bones of the same individual. Moreover, elemental mapping of the CB and MB using a laser ablation-ICP-MS revealed that Mn, Zn, and Cu contents in the MB which are used for activating bone morphogenic protein were higher than those in CB. According to the mechanism of Ca isotope fractionation reported in our previous study, the difference in Ca isotope ratio between MB and CB can be explained by the change in bone turnover rate, i.e., the balance between bone formation and resorption. Therefore, the difference in Ca isotope ratio between MB and CB reflects the different Ca balances during the bone tissue formation of each part.</p>

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