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Effects of ecological factors on the diurnal activity rhythm of Yakutian black-capped marmots (Marmota camtschatica bungei) in the arctic
Authors:Yu M Semenov  R Ramuss  M Leberre
Institution:(1) Yakutsk Institute of Biology, Siberian Division, Russian Academy of Sciences, pr. Lenina 41, 677891 Yakutsk, Russia;(2) Claude Bernard University, Lyons 1, France
Abstract:It is established that the activity of marmots (the genusMarmota) on the surface is timed to the daylight period. In the Arctic, under conditions of continuous illumination (the polar day), the diurnal rhythm of black-capped marmotsMarmota camtschatica bungei on the surface has a “daylight” pattern. The main external regulator of the diurnal rhythm is the altitude of the sun above the horizon. In the cold period, however, the effect of air temperature on animal activity becomes stronger.
Keywords:black-capped marmot  arctic conditions  polar day  diurnal activity  altitude of the sun  temperature
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