Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel
We compared patterns of core body temperature ( T b ) change, including inter-individual synchrony, in 2 free-living arctic hibernators that differ in size and sociality, the Alaska marmot ( Marmota broweri ) and the arctic ground squirrel ( Urocitellus parryii ). We report overwinter T b changes fr...
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fthighwire:oai:open-archive.highwire.org:jmammal:97/1/135 2023-05-15T14:31:28+02:00 Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel Lee, Trixie N. Kohl, Franziska Buck, C. Loren Barnes, Brian M. 2016-01-20 00:00:00.0 text/html http://jmammal.oxfordjournals.org/cgi/content/short/97/1/135 https://doi.org/10.1093/jmammal/gyv163 en eng Oxford University Press http://jmammal.oxfordjournals.org/cgi/content/short/97/1/135 http://dx.doi.org/10.1093/jmammal/gyv163 Copyright (C) 2016, Oxford University Press Feature Article TEXT 2016 fthighwire https://doi.org/10.1093/jmammal/gyv163 2016-11-16T18:42:18Z We compared patterns of core body temperature ( T b ) change, including inter-individual synchrony, in 2 free-living arctic hibernators that differ in size and sociality, the Alaska marmot ( Marmota broweri ) and the arctic ground squirrel ( Urocitellus parryii ). We report overwinter T b changes from 3 to 4 marmots from the same hibernaculum in each of 3 years and from 7 ground squirrels that hibernated at 2 nearby burrow sites in 1 year. Very close synchrony in the timing of torpor and arousal cycles in Alaska marmots indicates social hibernation and thermoregulation, while lack of synchrony in arctic ground squirrels further confirms solitary hibernation. The mean duration between the first and last marmot measured within the group to initiate an arousal was 3.7±2.5h and to recool to 30°C during torpor entrance was 5.7±3.7h. The minimum T b recorded in marmots was 0.6°C and in ground squirrels was −2.0°C. Marmots entering torpor displayed an interrupted pattern of T b change defined by 2 distinct rates of cooling, early and late during entry, that differed by 21-fold. Ground squirrels cooled in a continuous pattern, initially 3-fold slower than marmots during rapid cooling but 4-fold faster during slow cooling. Both species must minimize energy expenditure to survive long arctic winters; our results suggest that Alaska marmots do this through social thermoregulation, while arctic ground squirrels decrease T b below freezing to minimize the difference between body and ambient temperatures. Text Arctic ground squirrel Arctic Urocitellus parryii Alaska HighWire Press (Stanford University) Arctic Journal of Mammalogy 97 1 135 144 |
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HighWire Press (Stanford University) |
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English |
topic |
Feature Article |
spellingShingle |
Feature Article Lee, Trixie N. Kohl, Franziska Buck, C. Loren Barnes, Brian M. Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
topic_facet |
Feature Article |
description |
We compared patterns of core body temperature ( T b ) change, including inter-individual synchrony, in 2 free-living arctic hibernators that differ in size and sociality, the Alaska marmot ( Marmota broweri ) and the arctic ground squirrel ( Urocitellus parryii ). We report overwinter T b changes from 3 to 4 marmots from the same hibernaculum in each of 3 years and from 7 ground squirrels that hibernated at 2 nearby burrow sites in 1 year. Very close synchrony in the timing of torpor and arousal cycles in Alaska marmots indicates social hibernation and thermoregulation, while lack of synchrony in arctic ground squirrels further confirms solitary hibernation. The mean duration between the first and last marmot measured within the group to initiate an arousal was 3.7±2.5h and to recool to 30°C during torpor entrance was 5.7±3.7h. The minimum T b recorded in marmots was 0.6°C and in ground squirrels was −2.0°C. Marmots entering torpor displayed an interrupted pattern of T b change defined by 2 distinct rates of cooling, early and late during entry, that differed by 21-fold. Ground squirrels cooled in a continuous pattern, initially 3-fold slower than marmots during rapid cooling but 4-fold faster during slow cooling. Both species must minimize energy expenditure to survive long arctic winters; our results suggest that Alaska marmots do this through social thermoregulation, while arctic ground squirrels decrease T b below freezing to minimize the difference between body and ambient temperatures. |
format |
Text |
author |
Lee, Trixie N. Kohl, Franziska Buck, C. Loren Barnes, Brian M. |
author_facet |
Lee, Trixie N. Kohl, Franziska Buck, C. Loren Barnes, Brian M. |
author_sort |
Lee, Trixie N. |
title |
Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
title_short |
Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
title_full |
Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
title_fullStr |
Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
title_full_unstemmed |
Hibernation strategies and patterns in sympatric arctic species, the Alaska marmot and the arctic ground squirrel |
title_sort |
hibernation strategies and patterns in sympatric arctic species, the alaska marmot and the arctic ground squirrel |
publisher |
Oxford University Press |
publishDate |
2016 |
url |
http://jmammal.oxfordjournals.org/cgi/content/short/97/1/135 https://doi.org/10.1093/jmammal/gyv163 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic ground squirrel Arctic Urocitellus parryii Alaska |
genre_facet |
Arctic ground squirrel Arctic Urocitellus parryii Alaska |
op_relation |
http://jmammal.oxfordjournals.org/cgi/content/short/97/1/135 http://dx.doi.org/10.1093/jmammal/gyv163 |
op_rights |
Copyright (C) 2016, Oxford University Press |
op_doi |
https://doi.org/10.1093/jmammal/gyv163 |
container_title |
Journal of Mammalogy |
container_volume |
97 |
container_issue |
1 |
container_start_page |
135 |
op_container_end_page |
144 |
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1766305093635801088 |