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Figure 3


Fig. 3. The relationship between theoretical values, as predicted by the model (Seymour and Seely, 1996), and mean empirical measurements from five echidna buried in coarse sand (fa=0.42). The curves are calculated from an equation for echidna tidal volume (Bech et al., 1992) the VO2 of a 2.9 kg echidna buried in sand. The upper curve represents an individual with a resting metabolic rate at steady state. The lower curve represents an individual with higher metabolic rate while actively burrowing into the substrate. Theoretical and empirically measured values were compared using paired Student t-test (minimum values, P=0.010; steady state values, P=0.001).





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