JEB -- Prassack et al. 204 (12): 2185 Figure IG2

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Fig. 2. P_CO2/P_O2 diagram. Diagram of gas exchange by diffusion in gas and water phases (modified from Dejours, 1981). For a given value of respiratory quotient (RQ), the relationship between (P_extO2-P_intO2, where P_extO2 is water P_O2 and P_intO2 is blood P_O2) and P_intCO2 is a straight line originating at the abscissa P_extO2. Increases in RQ (non-pulmonary) and decreases in RQ (pulmonary) shift P_CO2 values of bimodal breathers to various levels between those for strict water- and air-breathers. A25, A15, A. ferox at 25 and 15°C; C25, C15, C. picta at 25 and 15°C. 1mmHg=0.133kPa.