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Fig. 3 | BMC Evolutionary Biology

Fig. 3

From: Mid-day siesta in natural populations of D. melanogaster from Africa exhibits an altitudinal cline and is regulated by splicing of a thermosensitive intron in the period clock gene

Fig. 3

Daytime and nighttime sleep are more fragmented in high altitude flies. a-d Shown are group averages for median sleep bout length (MSBL) (a, b) and number of sleep bouts (c, d) for either high (blue bar) or low (red bar) altitude flies from Cameroon and Kenya at the indicated temperatures and 6-h time interval during LD (i.e., ZT3-9 or ZT15-21) or DD1 (i.e., CT3-9 or CT15-21) (bottom of panels). The results shown are based on the same flies and activity data used to generate Figs. 1 and 2. ZT3-9 and ZT15-21 denote 6-h periods during the mid-day and mid-night in LD, respectively; CT3-9, and CT15-21 denote 6-h periods of ‘subjective mid-day’ and ‘subjective mid-night’ in DD1, respectively. Values for high altitude and low altitude flies are significantly different using student’s t-test; *, p < 0.05; **, p < 0.01

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