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Figure 5


Fig. 5. Arousal events with subsequent re-entry into hibernation for two echidnas (females 3A61 and 006F). (A) Tb (open circles) and Tref (crosses and grey line). Solid black lines are the regression lines calculated from the semi-log plots in (B). (B) Natural logarithm of the adjusted Tb values (Tb minus the equilibrium Tb) plotted against time (h) from the start of the cooling episode. The solid line is the linear regression through these data. r2=0.99 for both regressions. The slope of the regression line is the cooling constant for the animal (h–1) and the reciprocal of the cooling constant is the time constant. For echidna 3A61, the time constant is 12.2 h, giving 36.6 h for 3 time constants or a 95% change. For echidna 006F, the time constant is 10.6 h, or 31.9 h for a 95% change.





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