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Fig. 3. Mean times (± S.E.M.) spent gaping
in lizards at three different levels of oxygen – 21% (filled circles),
10% (open circles) and 6% O2 (filled triangles) – during 15
min periods of observations of lizards that were in thermal equilibrium with
different environmental temperatures (30–40°C). The broken lines
represent Hill equations (see equation 1) fitted through the mean data. The
vertical dotted lines represent the mean time at which lizards spent 50% of
their time gaping (ET50) at each level of oxygen inspired,
as calculated from each lizard. The inset graph refers to the
ET50 values for male (filled circles) and female lizards
(open circles) at 21, 10 and 6% O2.
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