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Tracing the Source of the Elephant And Hippopotamus Ivory from ...

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Figure 35: Average δ 13 C values <strong>of</strong> elephant bone collagen <strong>from</strong> twelve African wildlife<br />

refuges. The diagonal dotted line (<strong>from</strong> 100% C3 = -21.5‰ to 100% C4 = -7.0‰) equals<br />

<strong>the</strong> relative contribution <strong>of</strong> C3 and C4 plants to <strong>the</strong> diet (van der Merwe et al. 1988: 165).<br />

<strong>the</strong> results suggested young elephants preferred graze while adults consumed more<br />

browse (Figure 36; see also Sukumar and Ramesh 1992: 537). These findings are<br />

elaborated upon by Sukumar and Ramesh (1992; 1995), and <strong>the</strong> problem <strong>of</strong> under-<br />

representation <strong>of</strong> C4 is also considered. The results are compared to data <strong>from</strong> African<br />

elephants (Tieszen et al. 1989) and presented in Table 4. The variance in sub-adults (

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