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Brief Communications
Nature 438, 1095-1096 (22 December 2005) | doi:10.1038/4381095a; Published online 21 December 2005
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Circadian organization in reindeer
Bob E. H. van Oort1, Nicholas J. C. Tyler2, Menno P. Gerkema3, Lars Folkow1, Arnoldus Schytte Blix1 & Karl-Arne Stokkan1
Abstract
These Arctic animals abandon their daily rhythms when it is dark all day or light all night.
Abstract
The light/dark cycle of day and night synchronizes an internal 'biological clock' that governs daily rhythms in behaviour, but this form of regulation is denied to polar animals for most of the year. Here we demonstrate that the continuous lighting conditions of summer and of winter at high latitudes cause a loss in daily rhythmic activity in reindeer living far above the Arctic Circle. This seasonal absence of circadian rhythmicity may be a ubiquitous trait among resident polar vertebrates.
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