Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus)
Feeding activity was recorded in captive Svalbard ptarmigan (Lagopus mutus hyperboreus) under natural photoperiodic conditions at 70°N and 79°N. At 79°N, activity was intermittent and non-circadian in summer, when the sun was permanently above the horizon, and in midwinter, when the sun was permanen...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1998
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Online Access: | http://dx.doi.org/10.1139/z98-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/z98-173 |
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crcansciencepubl:10.1139/z98-173 2024-10-13T14:05:28+00:00 Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) Reierth, Eirik Stokkan, Karl-Arne 1998 http://dx.doi.org/10.1139/z98-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/z98-173 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 76, issue 11, page 2031-2039 ISSN 0008-4301 1480-3283 journal-article 1998 crcansciencepubl https://doi.org/10.1139/z98-173 2024-09-19T04:09:50Z Feeding activity was recorded in captive Svalbard ptarmigan (Lagopus mutus hyperboreus) under natural photoperiodic conditions at 70°N and 79°N. At 79°N, activity was intermittent and non-circadian in summer, when the sun was permanently above the horizon, and in midwinter, when the sun was permanently lower than 6° below the horizon. The intermittent feeding pattern was evident in summer at 70°N, whereas feeding activity in winter appeared to be entrained. In spring and autumn all birds were diurnal, with morning and evening bouts of feeding activity. The phase relationship between the onset or end of activity and the photoperiod showed marked changes, especially at 79°N, but in general, activity onset was more precise relative to twilight than activity end. At 79°N there was a sigmoidal relationship between activity time and photoperiod and activity time was longer in autumn than in spring at equal photoperiods. Based on our results, the activity pattern of Svalbard ptarmigan may be described in terms of a two-oscillator model, although a one-oscillator model cannot be excluded. The possibility is discussed that rhythmic feeding or food availability may act as a zeitgeber in addition to the light-dark cycle. Article in Journal/Newspaper Arctic Lagopus mutus Svalbard Canadian Science Publishing Arctic Svalbard Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) Canadian Journal of Zoology 76 11 2031 2039 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Feeding activity was recorded in captive Svalbard ptarmigan (Lagopus mutus hyperboreus) under natural photoperiodic conditions at 70°N and 79°N. At 79°N, activity was intermittent and non-circadian in summer, when the sun was permanently above the horizon, and in midwinter, when the sun was permanently lower than 6° below the horizon. The intermittent feeding pattern was evident in summer at 70°N, whereas feeding activity in winter appeared to be entrained. In spring and autumn all birds were diurnal, with morning and evening bouts of feeding activity. The phase relationship between the onset or end of activity and the photoperiod showed marked changes, especially at 79°N, but in general, activity onset was more precise relative to twilight than activity end. At 79°N there was a sigmoidal relationship between activity time and photoperiod and activity time was longer in autumn than in spring at equal photoperiods. Based on our results, the activity pattern of Svalbard ptarmigan may be described in terms of a two-oscillator model, although a one-oscillator model cannot be excluded. The possibility is discussed that rhythmic feeding or food availability may act as a zeitgeber in addition to the light-dark cycle. |
format |
Article in Journal/Newspaper |
author |
Reierth, Eirik Stokkan, Karl-Arne |
spellingShingle |
Reierth, Eirik Stokkan, Karl-Arne Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
author_facet |
Reierth, Eirik Stokkan, Karl-Arne |
author_sort |
Reierth, Eirik |
title |
Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
title_short |
Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
title_full |
Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
title_fullStr |
Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
title_full_unstemmed |
Activity rhythm in High Arctic Svalbard ptarmigan ( Lagopus mutus hyperboreus) |
title_sort |
activity rhythm in high arctic svalbard ptarmigan ( lagopus mutus hyperboreus) |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/z98-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/z98-173 |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Arctic Svalbard Midwinter |
geographic_facet |
Arctic Svalbard Midwinter |
genre |
Arctic Lagopus mutus Svalbard |
genre_facet |
Arctic Lagopus mutus Svalbard |
op_source |
Canadian Journal of Zoology volume 76, issue 11, page 2031-2039 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z98-173 |
container_title |
Canadian Journal of Zoology |
container_volume |
76 |
container_issue |
11 |
container_start_page |
2031 |
op_container_end_page |
2039 |
_version_ |
1812811560868904960 |