Data from: When the sun never sets: diverse activity rhythms under continuous daylight in free-living arctic-breeding birds

Silke S. Steiger, Mihai Valcu, Kamiel Spoelstra, Barbara Helm, Martin Wikelski & Bart Kempenaers
Circadian clocks are centrally involved in the regulation of daily behavioural and physiological processes. These clocks are synchronized to the 24 h day by external cues (Zeitgeber), the most important of which is the light–dark cycle. In polar environments, however, the strength of the Zeitgeber is greatly reduced around the summer and winter solstices (continuous daylight or continuous darkness). How animals time their behaviour under such conditions has rarely been studied in the wild. Using...
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