+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Aboveground activity rhythm in Arctic black-capped marmot (Marmota camtschatica bungei Katschenko 1901) under polar day conditions



Aboveground activity rhythm in Arctic black-capped marmot (Marmota camtschatica bungei Katschenko 1901) under polar day conditions



Acta Oecologica 22(2): 99-107



Daily aboveground activity of wild black-capped marmots of Yakutia (Marmota camtschatica bungei) was recorded under 'polar day' conditions at 71[degree]56' N and 127[degree]19' E (north of the Polar Circle). From the beginning of May until the end of August, the sun was permanently above or close to the horizon. However under this condition of continuous lighting, the aboveground activity of these arctic hibernating mammals was periodic. Onset and end of activity showed marked changes throughout the seasons. Activity time increased strongly from hibernation emergence until the end of July and then decreased slowly until onset of hibernation. Below daily mean temperatures of 5 [degree]C, activity started when the sun was 35[degree] above the horizon, and ended when it dropped below 28[degree]. When daily mean temperatures were above 5 [degree]C, activity onset was synchronised with a solar altitude around 17-18[degree] and activity ended at 10[degree]. Activity onset was more precise relative to the solar altitude than the end of activity. This may be explained by late feeding bouts, following a midday thermal stress. In absence of rapid natural light-dark (LD) transitions that occur at civil twilight, our results suggest that the activity pattern of black-capped marmots may be synchronised by the light cycle through the solar altitude and ambient temperature.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 010111939

Download citation: RISBibTeXText

DOI: 10.1016/s1146-609x(01)01103-1


Related references

Effects of ecological factors on the diurnal activity rhythm of Yakutian black-capped marmots (Marmota camtschatica bungei) in the Arctic. Ekologiya (Moscow) (2): 135-139, 2000

The black-capped marmot (Marmota camtschatica Pall.) in Yakutia. Polish Ecological Studies 20(3-4): 519-522, 1994

Intraspecific divergence of the black-capped marmot Marmota camtschatica. Zoologicheskii Zhurnal 78(7): 866-877, 1999

The black-capped marmot (Marmota camtschatica Pall.) in the Kronotsky Reserve. Unknown, 1994

Hibernation of the black-capped marmot Marmota camtschatica with body temperatures of 0 and -1°C. Doklady Biological Sciences 447: 381-385, 2013

Hibernation in black-capped marmot (Marmota camtschatica Pallas, 1811). Unknown, 1992

Specific features of hibernation in the black-capped marmot (Marmota camtschatica) from Yakutia. Zoologicheskii Zhurnal 79(9): 1114-1123, 2000

The black-capped marmot (Marmota camtschatica Pall.) in Yakutia (the north-eastern part of the USSR). Unknown, 1992

Geographical variation of the sound signal of black-capped marmot, Marmota camtschatica (Rodentia, Sciuridae). Zoologicheskii Zhurnal 702: 155-159, 1991

Distribution, biology and breeding in captivity of black-capped marmot, Marmota camtschatica (Rodentia, Sciuridae). Zoologicheskii Zhurnal 73(7-8): 209-222, 1994

A geographical isolate of the black capped marmot marmota camtschatica in the anyui highland russian sfsr ussr. Zoologicheskii Zhurnal 66(6): 954-956, 1987

A geographical isolate of the black-capped marmot Marmot camtschatica in the Anyui Highland. Zoologicheskii Zhurnal 666: 954-956, 1987

Parasites of the marmot Marmota camtschatica Pall. Zoologicheskii Zhurnal 39: 1435-1437, 1960

The oekology of the marmot (Marmota camtschatica Pall.). Byull Obshch. IsPrir. Biol: 114-115, 1960

Delayed dispersal and social care of young adaptations of the alpine marmot Marmota marmota to glacial conditions Verzogerte Abwanderung und gemeinschaftliche Jungenfursorge Anpassungen des Alpenmurmeltieres Marmota marmota an eiszeitliche Lebensbedingungen. Stapfia. 21 Oktober; 63: 33-42, 1999