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Fig. 3. Effect of changes in aerial O2 partial pressure
(PO2,air) on (A) air-breathing frequency
(fab), (B) O2 consumption rate
(
O2; total,
•; aquatic, 
; aerial, 
) and (C) mean O2 uptake per
breath (VO2/breath) of Trichogaster
leeri. (For fab, total
O2, aerial
O2 and
VO2/breath, N=3 for 5 kPa treatment as
individual breaths were invisible on the others and N=7 for remaining
treatments; for aquatic
O2 N=7
for all treatments.) Equations of regression lines: (A)
fab=65.8–30.3log(PO2,air);
(B) log(aquatic
O2)=2.16–0.18log(PO2,air);
log(aerial
O2)=1.04+0.413log(PO2,air);
(C) log(VO2/breath)=
–1.01+0.98log(PO2,air). Treatments not
denoted by the same letter are significantly different (in B, a–c denote
aerial O2, d,e
denote aquatic
O2).
Measurements were made at 5, 10, 21, 40 and 60 kPa; some symbols are offset
for presentation. All data are shown as means ± s.e.m.
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