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Fig. 3. Relationship between the equilibrium of 13C-labelled bicarbonate
with varying amounts of CO2. The enrichment values have been
log-converted and plotted against the log-converted volume of CO2
added in moles. The relationship was linear and significant
(Regression; y=0.721.25x,
F1,31=7367.5, P<0.001). The equation for the
relationship was used to calculate the size of the body bicarbonate pool
(Nc) in moles and subsequently ml of CO2 given
a known isotope enrichment for each bird. See text for details.