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Fig. 3. Relationship between the equilibrium enrichment of 0.2 ml of 0.29 mol
l-1 labelled bicarbonate with varying amounts of CO2.
The volumes of CO2 added in moles were log-converted and plotted
against the log-converted enrichment values. The relationship was linear
(r2=0.99) and described by y=1.24x+0.63.
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 the known equilibrium isotope enrichment in each
bird.