“…As no universally accepted criteria exist to evaluate apatite preservation (Zazzo, 2014;Salesse et al, 2014), we use samples with good collagen preservation because the organic matrix may involve both better protection of the bioapatite and lower isotope exchange with water (Hu et al, 2006;Iacumin et al, 2014). In addition to gaining insight on potential carbonate diagenesis, the excess carbonate carbon was evaluated thanks to the calcium carbonate content (CaCO 3 %) and the homogeneity of the apatite carbonate carbon isotope values was assessed based on the correlation between CaCO 3 % and δ 13 C ap (Ambrose et al, 1997) as well as between δ 13 C ap and δ 13 C col (Lee-Thorp and Sponheimer, 2003;Pechenkina et al, 2005), in both cases using the Spearman correlation test. Our dietary reconstruction relies primarily on collagen data.…”