1. (A) The relationship between the critical oxygen partial pressure (Pcrit) and the regulated rate of oxygen consumption (routine rates that are independent of oxygen partial pressure).
(A) The relationship between the critical oxygen partial pressure (Pcrit) and the regulated rate of oxygen consumption (routine rates that are independent of oxygen partial pressure). Variation along the x-axis indicates the effect of evolved metabolic rates on Pcrit, while variation along the y-axis indicates adaptation to regional differences in O2 concentration. (B) The relationship between Pcrit and regulated rates of O2 consumption () for individuals living in regions of varying oxygen content (colors represent regions as in Fig. 2). The slopes of the regression lines are not significantly different, but the lines for Antarctica, Hawaii and California are significantly different from each other.
Brad A. Seibel J Exp Biol 2011;214:
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