Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea)
Organisms use circadian rhythms to anticipate and exploit daily environmental oscillations. While circadian rhythms are of clear importance for inhabitants of tropic and temperate latitudes, its role for permanent residents of the polar regions is less well understood. The high Arctic Svalbard ptarm...
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doaj-eafa7fd0bef949aeb0f2ec0372bd68432021-03-08T05:34:41ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2021-03-011210.3389/fphys.2021.633866633866Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea)Daniel Appenroth0Andreas Nord1Andreas Nord2David G. Hazlerigg3Gabriela C. Wagner4Gabriela C. Wagner5Arctic Chronobiology and Physiology, Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, NorwayArctic Chronobiology and Physiology, Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, NorwaySection for Evolutionary Ecology, Department of Biology, Lund University, Lund, SwedenArctic Chronobiology and Physiology, Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, NorwayArctic Chronobiology and Physiology, Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Forest and Forest Resources, Norwegian Institute of Bioeconomy Research (NIBIO), Tromsø, NorwayOrganisms use circadian rhythms to anticipate and exploit daily environmental oscillations. While circadian rhythms are of clear importance for inhabitants of tropic and temperate latitudes, its role for permanent residents of the polar regions is less well understood. The high Arctic Svalbard ptarmigan shows behavioral rhythmicity in presence of light-dark cycles but is arrhythmic during the polar day and polar night. This has been suggested to be an adaptation to the unique light environment of the Arctic. In this study, we examined regulatory aspects of the circadian control system in the Svalbard ptarmigan by recording core body temperature (Tb) alongside locomotor activity in captive birds under different photoperiods. We show that Tb and activity are rhythmic with a 24-h period under short (SP; L:D 6:18) and long photoperiod (LP; L:D 16:8). Under constant light and constant darkness, rhythmicity in Tb attenuates and activity shows signs of ultradian rhythmicity. Birds under SP also showed a rise in Tb preceding the light-on signal and any rise in activity, which proves that the light-on signal can be anticipated, most likely by a circadian system.https://www.frontiersin.org/articles/10.3389/fphys.2021.633866/fullArcticchronobiologycircadian rhythmheterothermyphotoperiodthermoregulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Daniel Appenroth Andreas Nord Andreas Nord David G. Hazlerigg Gabriela C. Wagner Gabriela C. Wagner |
spellingShingle |
Daniel Appenroth Andreas Nord Andreas Nord David G. Hazlerigg Gabriela C. Wagner Gabriela C. Wagner Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) Frontiers in Physiology Arctic chronobiology circadian rhythm heterothermy photoperiod thermoregulation |
author_facet |
Daniel Appenroth Andreas Nord Andreas Nord David G. Hazlerigg Gabriela C. Wagner Gabriela C. Wagner |
author_sort |
Daniel Appenroth |
title |
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) |
title_short |
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) |
title_full |
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) |
title_fullStr |
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) |
title_full_unstemmed |
Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea) |
title_sort |
body temperature and activity rhythms under different photoperiods in high arctic svalbard ptarmigan (lagopus muta hyperborea) |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Physiology |
issn |
1664-042X |
publishDate |
2021-03-01 |
description |
Organisms use circadian rhythms to anticipate and exploit daily environmental oscillations. While circadian rhythms are of clear importance for inhabitants of tropic and temperate latitudes, its role for permanent residents of the polar regions is less well understood. The high Arctic Svalbard ptarmigan shows behavioral rhythmicity in presence of light-dark cycles but is arrhythmic during the polar day and polar night. This has been suggested to be an adaptation to the unique light environment of the Arctic. In this study, we examined regulatory aspects of the circadian control system in the Svalbard ptarmigan by recording core body temperature (Tb) alongside locomotor activity in captive birds under different photoperiods. We show that Tb and activity are rhythmic with a 24-h period under short (SP; L:D 6:18) and long photoperiod (LP; L:D 16:8). Under constant light and constant darkness, rhythmicity in Tb attenuates and activity shows signs of ultradian rhythmicity. Birds under SP also showed a rise in Tb preceding the light-on signal and any rise in activity, which proves that the light-on signal can be anticipated, most likely by a circadian system. |
topic |
Arctic chronobiology circadian rhythm heterothermy photoperiod thermoregulation |
url |
https://www.frontiersin.org/articles/10.3389/fphys.2021.633866/full |
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