Food mechanical properties and isotopic signatures in forest versus savannah dwelling eastern chimpanzees.

Our model results (see Methods for details) show that the differences between chimpanzees from Ngogo and Issa were highly significant in the δ 13 C values ( χ 2 = 61.45, df = 1, p < 0.0001) and the δ 15 N values ( χ 2 = 80.67, df = 1, p < 0.0001), with Issa chimpanzees being less depleted in 13 C, and much lower in 15 N (Fig. 2c , Table 1 ).

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