Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea)
(2021) In Frontiers in Physiology 12.- Abstract
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.... (More)
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.
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- author
- Appenroth, Daniel ; Nord, Andreas LU ; Hazlerigg, David G. and Wagner, Gabriela C.
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Arctic, chronobiology, circadian rhythm, heterothermy, photoperiod, Svalbard ptarmigan, thermoregulation
- in
- Frontiers in Physiology
- volume
- 12
- article number
- 633866
- publisher
- Frontiers Media S. A.
- external identifiers
-
- pmid:33762966
- scopus:85102933976
- ISSN
- 1664-042X
- DOI
- 10.3389/fphys.2021.633866
- language
- English
- LU publication?
- yes
- id
- 574f5ba0-7d26-4008-b247-9c4f548e8120
- date added to LUP
- 2021-03-31 09:20:30
- date last changed
- 2024-06-15 08:58:10
@article{574f5ba0-7d26-4008-b247-9c4f548e8120,
abstract = {{<p>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 (T<sub>b</sub>) alongside locomotor activity in captive birds under different photoperiods. We show that T<sub>b</sub> 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 T<sub>b</sub> attenuates and activity shows signs of ultradian rhythmicity. Birds under SP also showed a rise in T<sub>b</sub> 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.</p>}},
author = {{Appenroth, Daniel and Nord, Andreas and Hazlerigg, David G. and Wagner, Gabriela C.}},
issn = {{1664-042X}},
keywords = {{Arctic; chronobiology; circadian rhythm; heterothermy; photoperiod; Svalbard ptarmigan; thermoregulation}},
language = {{eng}},
publisher = {{Frontiers Media S. A.}},
series = {{Frontiers in Physiology}},
title = {{Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan (Lagopus muta hyperborea)}},
url = {{http://dx.doi.org/10.3389/fphys.2021.633866}},
doi = {{10.3389/fphys.2021.633866}},
volume = {{12}},
year = {{2021}},
}