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Spatially-Resolved Ca Isotopic and Trace Element Variations in Human Deciduous Teeth Record Diet and Physiological Change

Li, Qiong, Nava, Alessia, Reynard, Linda M., Thirlwall, Matthew, Bondioli, Luca, Müller, Wolfgang (2020) Spatially-Resolved Ca Isotopic and Trace Element Variations in Human Deciduous Teeth Record Diet and Physiological Change. Environmental Archaeology, . pp. 1-10. ISSN 1461-4103. E-ISSN 1749-6314. (doi:10.1080/14614103.2020.1758988) (KAR id:82949)


Dental enamel represents an important mineralized archive of an individual’s early life. Previously, isotopic (Ca) or trace element ratios (Sr/Ca, Ba/Ca) have been used to reveal dietary and weaning histories, although few studies have utilized both proxies to evaluate the respective results. Here we report histologically-defined, spatially-resolved Ca-isotope (laser-cut & TIMS) and trace element ratio (Sr/Ca, Ba/Ca; LA-ICPMS) profiles along the enameldentine-junction in three deciduous dental crowns of three early twentieth century Italian infants (Modern-22, 27, 29). Modern-27 and Modern-29 display overall similar patterns of Caisotope variation and reflect an overall increase of >1.0‰ in δ44/40Ca across and after birth. Whilst the Sr/Ca and Ba/Ca signals of Modern-27 suggest a mixed breast-formula feeding, the two elemental proxies in Modern-29 hint at nearly exclusive breastfeeding until ∼4 months, followed by introduction of formula. A ∼0.5‰ δ44/40Ca decrease across and after birth together with Sr/Ca ratios in Modern-22 suggest a dominant breastfeeding history for the first ∼5–8 months. Enamel Ca-isotope data alone are not sufficient to distinguish between breastfed or formula-fed infants. In addition, Ca-isotope profiles in deciduous enamel suggest a connection between prominent physiological stress like birth and negative

Ca-isotope excursions, underlining the physiological overprint of Ca-isotope signatures.

Item Type: Article
DOI/Identification number: 10.1080/14614103.2020.1758988
Uncontrolled keywords: Ca isotopes, Sr/Ca, Ba/Ca, dental enamel, laser-cutting microsampling, TIMS, LA-ICPMS
Subjects: H Social Sciences
Divisions: Divisions > Division of Human and Social Sciences > School of Anthropology and Conservation
Depositing User: Alessia Nava
Date Deposited: 09 Nov 2020 14:54 UTC
Last Modified: 19 Jul 2022 11:40 UTC
Resource URI: (The current URI for this page, for reference purposes)

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