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Fig. 7. Various threshold parameters in bearded dragons as they pertain to the appropriateness of thermoregulation. (A) The plot of ET₅₀ versus cumulative time spent gaping during experimental procedures demonstrates that ET₅₀ estimates provided a good fit across all three levels of O₂. (B) Cloacal discharge threshold (T_CD) in normoxia versus mean cage temperature (see Materials and methods) showed no significant relationships. (C) A significant relationship between ET₅₀ in normoxia and mean cage temperature was not apparent, although a significant intercept did occur, suggesting that the ET₅₀ tends to occur at temperatures higher than preferred cage temperatures. (D) There was a significant relationship between ET₁₀ (the temperature at which the lizards were gaping for 10% of the time) and mean cage temperature, although no significant intercept, suggesting an isometric relationship between the two variables.

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