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Figure 2 | Frontiers in Zoology

Figure 2

From: Urban-like night illumination reduces melatonin release in European blackbirds (Turdus merula): implications of city life for biological time-keeping of songbirds

Figure 2

Variation in daily cycles of locomotor activity. We used one week of activity data before the start of the melatonin sampling, in both winter (a) and summer (b). X-axis represents time of day, Y-axis represents log-transformed mean (Ā± SEM) activity level (counts per hour). For sample sizes and meaning of colours and symbols see FigureĀ 1. In winter we detected treatment effects over the entire day, in summer only at specific hours (depicted by red asterisks).

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