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Figure 7


Fig. 7. Relationships between arterial oxygen loading and (A) body temperature change, (B) bill temperature change, or (C) oxygen consumption rate during stepwise hypoxia in bar-headed geese (light grey triangles), greylag geese (black squares) and pekin ducks (dark grey circles). Arterial O2 concentration data were measured in our previous study (Scott and Milsom, 2007), which used a very similar stepwise hypoxia protocol to the present study. Temperature and O2 consumption data are the values after 15 min at each level of hypoxia. Slopes of linear regressions of body temperature against content were similar between species (bar-headed geese, 0.46±0.08; greylag geese, 0.55±0.03; pekin ducks, 0.56±0.07). Slopes of bill temperature against content were similar between bar-headed geese and pekin ducks (bar-headed geese, –2.5±0.6; greylag geese, –0.80±0.25; pekin ducks, –2.0±0.4). The slope of O2 consumption rate against content was highest in bar-headed geese (–0.68±0.21; significantly higher than greylag geese), followed by pekin ducks (–0.42±0.12), and greylag geese (–0.26±0.04). All regressions were statistically significant.





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