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Figure 4


Fig. 4. Effect of changing aerial O2 partial pressure (PO2,air) on the O2 partial pressure (PO2) in the air-breathing organ (ABO) of Trichogaster leeri at the end of apnoea assuming ABO volume is constant (•) and totally compliant ({circ}) (N=2 for 5 kPa and N=6 for 10 kPa as individual breaths were invisible on the others; and N=7 for remaining treatments). Equations of regression lines: (constant ABO volume) log(end-apnoea ABO-PO2)=–0.0023+0.892log(PO2,air); (totally compliant ABO volume) log(end-apnoea ABO-PO2)=–0.084+0.977log(PO2,air). Treatments not denoted by the same letter are significantly different (a–e, constant ABO volume; f–j, compliant ABO). Measurements were made at 5, 10, 21, 40 and 60 kPa; symbols are offset for presentation. All data are shown as means ± s.e.m., but error bars are concealed by symbols at low PO2,air.