Figure 6.

Modifying light intensity during evening twilight alters the foraging onset in ants at three nests (A–C). (a) The experimental set-up, (b) outbound activity and (c) light intensity in the baseline (blue), control (red) and experimental (green) conditions are shown. Activity was recorded by a camera (C) placed over the nest entrance (N). In the control condition, in addition, a dome (D) was placed above the nest entrance with lights OFF (L–). In the experimental condition, a dome was placed above the nest entrance with lights ON (L+) for 60 min after sunset.