Figure 5.
The magnitude of the phase shifts after an 8 h LD phase delay. A, Determination of the phase angle between the evening activity peak before and after the LD phase shift. The phase of the evening activity peak was determined on the day when the light phase was prolonged to induce a shift in the LD cycle. The next day was regarded as day 1, when the activity phase shift occurred. B, The magnitude of the phase shifts (mean ± SEM) on day 1 (left) and day 2 (right) after an 8 h LD phase delay. The control strains (CantonS, w+, and w) were phase shifted by 6–7 h in response to an 8 h LD shift on the first day, suggesting that these flies almost finished re-entrainment within 1 d. Lowercase letters above the bars indicate significant differences revealed by Tukey's multiple comparison test (p < 0.01).