Figure 4 Equilibrium and hysteresis curves of dormice’s body temperature as a function of air temperature variability (a and b for female and male, respectively). Dashed lines between the two bifurcation points F 1,2, show the bistability region separating the basins of attraction of the two stable branches, i.e. the hibernation state (green lines) and the activity state (black lines); a1 and b1 show the potential for body temperature for female and male dormouse respectively. The entire time series was used here.