Carbon isotope fractionation between diet,breath CO2, and bioapatite in different mammals |
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| Institution: | 1. Université Claude Bernard Lyon 1, UMR CNRS 5276 - Laboratoire de Géologie de Lyon, Terre, Planètes et Environnement - 2 rue Raphaël Dubois, 69622 Villeurbanne Cedex, France;2. Université Pierre et Marie Curie Paris 6, UMR CNRS 7207 - Centre de recherche sur la Paleobiodiversité et les Paléoenvironnements - Site Jussieu - Tour 56 - 5ème étage, boîte courrier 104, 4, Place Jussieu, 75252 Paris Cedex 05, France;1. Institute of Human Origins and School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287, USA;2. School of Social Science, Archaeology Program, University of Queensland, Brisbane, QLD 4072, Australia;3. Department of Anatomical Sciences, Health Sciences Center, Stony Brook University, Stony Brook, NY 11794-8081, USA |
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| Abstract: | The carbon isotope fractionation between tooth enamel bioapatite, breath CO2, and diet was measured for voles, rabbits, pigs, and cattle on controlled diets. The measured fractionation (expressed as isotope enrichment ɛ*) between enamel and diet was 11.5 ± 0.3‰, 12.8 ± 0.7‰, 13.3 ± 0.3‰, and 14.6 ± 0.3‰ for these respective species. There is a 1:1 correlation between ɛ*breath–diet and ɛ*enamel–diet (r2 = 0.94, p < 0.01), whereas our data do not resolve significant inter-species differences in ɛ*enamel–breath. These findings are consistent with the hypothesis that inter-species differences in ɛ*bioapatite–diet are primarily a result of differences in digestive physiology, rather than differences in the magnitude of fractionation between mineral and body fluid. |
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