Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus)
The possibility that feeding may act as a zeitgeber has been investigated in captive Svalbard ptarmigan by recording feeding or food-searching activity (FA) in birds given periodic access to food (PAF) under light-dark (LD) cycles or in continuous bright (LL) or dim light (DD) conditions. Except dur...
Published in: | Journal of Biological Rhythms |
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Online Access: | http://dx.doi.org/10.1177/074873049801300504 https://journals.sagepub.com/doi/pdf/10.1177/074873049801300504 |
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crsagepubl:10.1177/074873049801300504 2024-10-06T13:50:27+00:00 Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) Reierth, Eirik Stokkan, Karl-Arne 1998 http://dx.doi.org/10.1177/074873049801300504 https://journals.sagepub.com/doi/pdf/10.1177/074873049801300504 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license Journal of Biological Rhythms volume 13, issue 5, page 393-402 ISSN 0748-7304 1552-4531 journal-article 1998 crsagepubl https://doi.org/10.1177/074873049801300504 2024-09-10T04:27:38Z The possibility that feeding may act as a zeitgeber has been investigated in captive Svalbard ptarmigan by recording feeding or food-searching activity (FA) in birds given periodic access to food (PAF) under light-dark (LD) cycles or in continuous bright (LL) or dim light (DD) conditions. Except during LL, anticipatory attempts to feed always occurred prior to the food access interval with a relatively stable phase relationship to the interval. There was always a second bout of feeding toward the end of the food access interval, which apparently corresponds to the afternoon bout of feeding, seen under LD and ad libitum access to food. During PAF, this afternoon peak of activity disappeared. When the LD cycle was phase delayed while restricted access to food remained unchanged, the afternoon peak of feeding was temporarily reestablished but was transiently shifted forward to reattain its position within the food access interval. After termination of PAF, the afternoon bout of feeding was reestablished through phase-delaying transients, with an initial phase corresponding to the previous food access interval. The results suggest that FA of Svalbard ptarmigan is controlled by 2 separate circadian oscillators, both of which can be entrained by light and food: a putative morning oscillator, which controls the activity associated with the beginning of the photoperiod or the food access interval, and a putative evening oscillator, which induces increased activity toward the end of these intervals. In their natural environment at very high latitudes, Svalbard ptarmigan deposit fat when the day length declines rapidly in autumn. Entrained by feeding, they appear to enjoy a longer daily period of food-searching activity than if day length was the only zeitgeber. Article in Journal/Newspaper Lagopus mutus Svalbard SAGE Publications Svalbard Journal of Biological Rhythms 13 5 393 402 |
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Open Polar |
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SAGE Publications |
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crsagepubl |
language |
English |
description |
The possibility that feeding may act as a zeitgeber has been investigated in captive Svalbard ptarmigan by recording feeding or food-searching activity (FA) in birds given periodic access to food (PAF) under light-dark (LD) cycles or in continuous bright (LL) or dim light (DD) conditions. Except during LL, anticipatory attempts to feed always occurred prior to the food access interval with a relatively stable phase relationship to the interval. There was always a second bout of feeding toward the end of the food access interval, which apparently corresponds to the afternoon bout of feeding, seen under LD and ad libitum access to food. During PAF, this afternoon peak of activity disappeared. When the LD cycle was phase delayed while restricted access to food remained unchanged, the afternoon peak of feeding was temporarily reestablished but was transiently shifted forward to reattain its position within the food access interval. After termination of PAF, the afternoon bout of feeding was reestablished through phase-delaying transients, with an initial phase corresponding to the previous food access interval. The results suggest that FA of Svalbard ptarmigan is controlled by 2 separate circadian oscillators, both of which can be entrained by light and food: a putative morning oscillator, which controls the activity associated with the beginning of the photoperiod or the food access interval, and a putative evening oscillator, which induces increased activity toward the end of these intervals. In their natural environment at very high latitudes, Svalbard ptarmigan deposit fat when the day length declines rapidly in autumn. Entrained by feeding, they appear to enjoy a longer daily period of food-searching activity than if day length was the only zeitgeber. |
format |
Article in Journal/Newspaper |
author |
Reierth, Eirik Stokkan, Karl-Arne |
spellingShingle |
Reierth, Eirik Stokkan, Karl-Arne Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
author_facet |
Reierth, Eirik Stokkan, Karl-Arne |
author_sort |
Reierth, Eirik |
title |
Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
title_short |
Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
title_full |
Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
title_fullStr |
Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
title_full_unstemmed |
Dual Entrainment by Light and Food in the Svalbard Ptarmigan ( Lagopus mutus hyperboreus) |
title_sort |
dual entrainment by light and food in the svalbard ptarmigan ( lagopus mutus hyperboreus) |
publisher |
SAGE Publications |
publishDate |
1998 |
url |
http://dx.doi.org/10.1177/074873049801300504 https://journals.sagepub.com/doi/pdf/10.1177/074873049801300504 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Lagopus mutus Svalbard |
genre_facet |
Lagopus mutus Svalbard |
op_source |
Journal of Biological Rhythms volume 13, issue 5, page 393-402 ISSN 0748-7304 1552-4531 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/074873049801300504 |
container_title |
Journal of Biological Rhythms |
container_volume |
13 |
container_issue |
5 |
container_start_page |
393 |
op_container_end_page |
402 |
_version_ |
1812178573883080704 |