NOCTURNAL ILLUMINATION DIMMER THAN STARLIGHT ALTERED THE CIRCADIAN RHYTHM OF ADULT LOCOMOTOR ACTIVITY OF A FRUIT FLY

Activity onset in experimental flies occurred approximately 5.4 hours prior to lights-on.

• Experimental flies showed a significant shift in activity onset compared to control flies, which aligned closely with lights-on.
• Despite differing activity onset times, both groups exhibited the same activity offset at lights-off.
• The duration of the active phase and activity passes per fly per cycle were significantly higher in experimental flies than in controls.
• When placed in constant darkness, experimental flies demonstrated a shortened free-running rhythm period, lengthened active phase, and increased activity passes compared to controls.
• The physiological adaptations observed in these flies suggest low sensitivity to dim light is suited for their natural environment.

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