Zinc isotope variations in archeological human teeth (Lapa do Santo, Brazil) reveal dietary transitions in childhood and no contamination from gloves

Autor(es):Mostrar menos -

Jaouen, Klervia ^{[1, 2]} ; Trost, Manuel ^[1] ; Bourgon, Nicolas ^{[1, 3]} ; Colleter, Rozenn ^{[4, 5]} ; Le Cabec, Adeline ^{[1, 6]} ; Tutken, Thomas ^[3] ; Oliveira, Rodrigo Elias ^[7] ; Pons, Marie Laure ^[8] ; Mejean, Pauline ^[2] ; Steinbrenner, Sven ^[1] ; Chmeleff, Jerome ^[2] ; Strauss, Andre ^[9]

Afiliação do(s) autor(es)

^[1] Max Planck Inst Evolutionary Anthropol, Dept Human Evolut, Leipzig - Germany

^[2] CNRS, Geosci Environm Toulouse, Observ Midi Pyrenees, UMR 5563, Toulouse - France

^[3] Johannes Gutenberg Univ Mainz, AG Angew & Analyt Palaontol, Mainz - Germany

^[4] Natl Inst Prevent Archeol Res, Inrap, Cesson Sevigne - France

^[5] Univ Toulouse, CNRS, AMIS, UMR 5288, Toulouse - France

^[6] Univ Bordeaux, UMR 5199, CNRS, PACEA, Pessac - France

^[7] Univ Sao Paulo, Inst Biociencias, Lab Arqueol & Antropol Ambiental & Evolut, Sao Paulo - Brazil

^[8] Aix Marseille Univ, CEREGE, CNRS, IRD, INRAE, Coll France, Aix En Provence - France

^[9] Univ Sao Paulo, Museu Arqueol & Etnol, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 15, n. 5 MAY 14 2020.
• Citações Web of Science: 0

Resumo

Zinc (Zn) isotope ratios of dental enamel are a promising tracer for dietary reconstruction in archeology, but its use is still in its infancy. A recent study demonstrated a high risk of Zn contamination from nitrile, and latex gloves used during chemical sample preparation. Here we assess the potential impact of the use of such gloves during enamel sampling on the Zn isotope composition of teeth from a population of early Holocene hunter gatherers from Lapa do Santo, Lagoa Santa, Minas Gerais, Brazil. We first examined the amount of Zn and its isotopic composition released from the gloves used in this study by soaking them in weak nitric acid and water. We compared Zn isotope ratios obtained from teeth that were sampled wearing nitrile, latex or no gloves. Finally, we performed a linear mixed model (LMM) to investigate post hoc the relationship between the gloves used for sampling and the Zn isotope variability in dental enamel. We found that the gloves used in this study released a similar amount of Zn compared to previous work, but only in acidic solution. Zn isotope ratios of teeth and the LMM identified no sign of significant Zn coming from the gloves when teeth were handled for enamel sampling. We hypothesize that Zn in gloves is mostly released by contact with acids. We found that the main source of Zn isotope variability in the Lapa do Santo population was related to the developmental stage of the tooth tissues sampled. We report identical results for two individuals coming from a different archeological context. Tooth enamel formed in utero and/or during the two first years of life showed higher Zn isotope ratios than enamel formed after weaning. More work is required to systematically investigate if Zn isotopes can be used as a breastfeeding tracer. (AU)

• Processo FAPESP: 17/16451-2 - Histórias indígenas de longa duração: o Brasil pré-colonial pela ótica da antropologia virtual e da arqueogenômica
• Beneficiário: André Menezes Strauss
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 08/51747-0 - Caracterização das práticas mortuárias dos caçadores-coletores pré-históricos da Lapa do Santo, Lagoa Santa (MG)
• Beneficiário: André Menezes Strauss
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 04/01321-6 - Origens e microevolução do homem na América: uma abordagem paleoantropológica (III)
• Beneficiário: Walter Alves Neves
• Modalidade de apoio: Auxílio à Pesquisa - Temático