Fig. 2. Relationships between the duration of the exposure to –5°C and (A) the pre-freeze mortality or (B) the recovery time after chill-coma in the adults of Pyrrhocoris apterus belonging to three different acclimation groups (LD, SD, SDA; see Fig. 1). In A, each data point represents a mortality rate in the group of 10–30 individuals [Boltzmann sigmoidal curves were used to fit the data: LD, R²=0.7103 (goodness of fit); SD, R²=0.7900]. The arrows show times necessary to kill 50% of the population sample (Lt50). In B, each data point represents a mean ± S.E.M. of 10 individuals. The probabilities that slopes of linear regressions deviate from zero were P<0.001 for all groups.