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Fig. 2 | BMC Evolutionary Biology

Fig. 2

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. 2

High altitude flies sleep less during the day. a-l The results are based on the same flies and activity data used in Fig. 1 and show group averages for daily sleep levels (expressed as the percentage of time flies are sleeping during 2 h time-windows) for either high altitude (blue line) or low altitude (red line) adult male flies from Cameroon and Kenya maintained at the indicated temperatures (right of panels) and light/dark conditions (top of panels). For LD, sleep data from the last 3 days were pooled, whereas for DD, the first day is shown (DD1). Horizontal bars at bottom of panels denote 12-h periods of light (white bar), dark (black bar) and ‘subjective daytime’ in DD (gray bar). ZT, zeitgeber time (hr); CT, circadian time (hr)

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