Palaeodietary studies commonly analyse 13C and 15N ratios in archaeological bone to infer past dietary habits, although 15N ratios can be influenced by a range of factors other than diet (aridity, manuring, soil conditions, etc.). 2H ratios have been shown to function as trophic level indicator (Birchall et al., 2005; Reynard and Hedges 2008), which can be very useful to aid our interpretation of the 13C and 15N ratios and improve our understanding of palaeodietary habits and subsistence practices. ,
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