Sleep deprivation by caffeine and mechanical disturbance of w1118 flies results in a decrease in egg output. Sleep deprivation by caffeine andmechanical.

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Sleep deprivation by caffeine and mechanical disturbance of w1118 flies results in a decrease in egg output. Sleep deprivation by caffeine andmechanical disturbanceof w1118 flies results in a decrease in egg output. (A) Sleep in minutes for every 30 min over a period of 24 h is shown for w1118 flies fed with standard food (Ctrl, N=28), flies fed with 0.5 mg ml−1 caffeine only during the day (Dcaf, N=25) and only during the night (Ncaf, N=24) averaged across two baseline (BS), three caffeine-feeding (CAF) and two recovery (RC) days. Horizontal white and black bars at the top represent day and night, respectively. (Bi) Daytime (top) and night-time (bottom) sleep of control, Dcaf and Ncaf flies are compared across BS, CAF and RC days. Dcaf flies show a significant increase in daytime sleep during RC days as compared with that during BS and CAF days. Ncaf flies show significantly lower levels of night-time sleep during CAF days as compared with that during BS and RC days, as well as night-time sleep of controls during CAF days (two-way ANOVA with treatment and days as fixed factors followed by post hoc Tukey's HSD test; *P<0.05; ***P<0.001). (Bii) Percentage total sleep loss during CAF days with respect to BS days plotted as a function of caffeine concentration shows that sleep loss is higher for a caffeine concentration of 0.5 mg ml−1 during both the day and night as compared with a concentration of 1.0 mg ml−1. (Ci) Number of eggs laid by control (N=25), Dcaf (N=24) and Ncaf (N=25) flies both during the day and night over a period of 6 days of caffeine (0.5 mg ml−1) treatment. * denotes significant differences between either Dcaf or Ncaf with control flies (*P<0.05; **P<0.01; ***P<0.001), whereas # indicates significant differences between Dcaf and Ncaf flies (Kruskal–Wallis test, #P<0.05; ##P<0.01; ###P<0.001). (Cii) Total number of eggs laid averaged across 6 days of caffeine treatment. Dcaf flies laid a significantly lower number of eggs as compared with control flies, whereas Ncaf flies laid a significantly lower number of eggs as compared with both control and Dcaf flies (one-way ANOVA with treatment as fixed factor followed by post hoc Tukey's HSD test; ***P<0.001). The experiment was repeated with similar results (data not shown). (D) Sleep in minutes for every 30 min over a period of 24 h averaged across 5 days is shown for control w1118 flies (Ctrl, N=26), flies receiving mechanical disturbance only during the day (Ddep, N=28) and only during the night (Ndep, N=27). (Ei) Daytime sleep (top) of Ddep flies is significantly reduced as compared with Ctrl and Ndep, whereas that of Ndep flies is significantly higher than that of Ctrl and Ddep. Night-time sleep (bottom) of Ndep flies is significantly lower than Ctrl and Ddep flies. (Eii) Total sleep of Ddep flies is significantly lower than Ctrl and that of Ndep flies is significantly lower than Ctrl and Ddep flies (one-way ANOVA with treatment as fixed factor followed by post hoc Tukey's HSD test for Ei and Eii; ***P<0.001). (Fi) Number of eggs laid by control, Ddep and Ndep flies during the day and night over a period of 5 days of mechanical deprivation protocol. * denotes significant differences between either Ddep or Ndep with control flies (*P<0.05; **P<0.01; ***P<0.001), whereas # indicates significant differences between Ddep and Ndep flies (Kruskal–Wallis test, #P<0.05, ##P<0.01). (Fii) Total number of eggs laid by Ctrl, Ddep and Ndep flies averaged across 5 days. Ddep flies show a significant reduction in the number of eggs laid as compared with Ctrl; Ndep flies laid even lower number of eggs significantly reduced as compared with both Ctrl and Ddep flies (Kruskal–Wallis test, ***P<0.001). Error bars are s.e.m. Sheetal Potdar et al. J Exp Biol 2018;221:jeb174771 © 2018. Published by The Company of Biologists Ltd