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Fig. 4. (A) Oxygen consumption rate increased during stepwise hypoxia in bar-headed
geese (light grey triangles), greylag geese (black squares) and pekin ducks
(dark grey circles). Bar-headed geese had higher oxygen consumption rates than
both other species during 7% inspired O2 (asterisks). Differences
between species persisted after mean oxygen consumption rates were corrected
for differences in body temperature depression (see Materials and methods),
using Q10 values of either 2 (short broken lines) or 3 (long broken
lines). (B) Oxygen consumption rates decreased rapidly during normoxic
recovery in all species.