Factors controlling the phenology and limits of hibernation in a sciurid
Dissertation (Ph.D.) University of Alaska Fairbanks, 2015 Animals that live in seasonal environments have a variety of adaptations to survive periods of low to no food availability. One such adaptation is hibernation, which is characterized by profound decreases in activity, metabolic rate, and in m...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/6196 2023-05-15T14:31:29+02:00 Factors controlling the phenology and limits of hibernation in a sciurid Richter, Melanie M. Buck, C. Loren Barnes, Brian M. Harris, Michael Drew, Kelly Kitaysky, Alexander 2015-08 http://hdl.handle.net/11122/6196 en_US eng http://hdl.handle.net/11122/6196 Department of Biology and Wildlife Dissertation phd 2015 ftunivalaska 2023-02-23T21:36:35Z Dissertation (Ph.D.) University of Alaska Fairbanks, 2015 Animals that live in seasonal environments have a variety of adaptations to survive periods of low to no food availability. One such adaptation is hibernation, which is characterized by profound decreases in activity, metabolic rate, and in most cases, body temperature. Among animals that hibernate, only two species are known to maintain low tissue temperature while defending significant temperature gradients, and the best studied of these is the Arctic ground squirrel (Urocitellus parryii). In the first chapter, we determine the lower ambient temperature limit of hibernation for an arctic ground squirrel (-26°C), and that a maximum torpid metabolic rate exists (0.37 mL O₂/g*h). This maximum torpid metabolic rate allows animals to defend a ~26°C temperature gradient between their core and their environment. In this chapter we also demonstrate that another, temperate, hibernating species, the golden-mantled ground squirrel (Callospermophilus lateralis), is capable of continuing hibernation at sub-freezing temperatures and can defend a temperature gradient of at least 9°C. Due to the extreme environment that Arctic ground squirrels inhabit, they have a very short growing season (~3-7 months) during which they must reproduce, grow, and accumulate energy stores prior to hibernation onset. In the second chapter we investigate the roles androgens play in hibernation phenology and male aggressive behavior. We use plasma samples collected from free-living animals and radioimmunoassays to determine circulating androgen levels. We then match the peaks in androgens to the timing of the two periods of male-male aggression (testosterone in the spring and dehydroepiandrosterone in the late summer/fall). We also present evidence to support testosterone as the main factor determining the timing of spring euthermy and emergence among reproductively mature males. In the third chapter we utilize captive animals to determine the importance of a cache to male reproductive ... Doctoral or Postdoctoral Thesis Arctic ground squirrel Arctic Urocitellus parryii Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks |
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Open Polar |
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University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 2015 Animals that live in seasonal environments have a variety of adaptations to survive periods of low to no food availability. One such adaptation is hibernation, which is characterized by profound decreases in activity, metabolic rate, and in most cases, body temperature. Among animals that hibernate, only two species are known to maintain low tissue temperature while defending significant temperature gradients, and the best studied of these is the Arctic ground squirrel (Urocitellus parryii). In the first chapter, we determine the lower ambient temperature limit of hibernation for an arctic ground squirrel (-26°C), and that a maximum torpid metabolic rate exists (0.37 mL O₂/g*h). This maximum torpid metabolic rate allows animals to defend a ~26°C temperature gradient between their core and their environment. In this chapter we also demonstrate that another, temperate, hibernating species, the golden-mantled ground squirrel (Callospermophilus lateralis), is capable of continuing hibernation at sub-freezing temperatures and can defend a temperature gradient of at least 9°C. Due to the extreme environment that Arctic ground squirrels inhabit, they have a very short growing season (~3-7 months) during which they must reproduce, grow, and accumulate energy stores prior to hibernation onset. In the second chapter we investigate the roles androgens play in hibernation phenology and male aggressive behavior. We use plasma samples collected from free-living animals and radioimmunoassays to determine circulating androgen levels. We then match the peaks in androgens to the timing of the two periods of male-male aggression (testosterone in the spring and dehydroepiandrosterone in the late summer/fall). We also present evidence to support testosterone as the main factor determining the timing of spring euthermy and emergence among reproductively mature males. In the third chapter we utilize captive animals to determine the importance of a cache to male reproductive ... |
author2 |
Buck, C. Loren Barnes, Brian M. Harris, Michael Drew, Kelly Kitaysky, Alexander |
format |
Doctoral or Postdoctoral Thesis |
author |
Richter, Melanie M. |
spellingShingle |
Richter, Melanie M. Factors controlling the phenology and limits of hibernation in a sciurid |
author_facet |
Richter, Melanie M. |
author_sort |
Richter, Melanie M. |
title |
Factors controlling the phenology and limits of hibernation in a sciurid |
title_short |
Factors controlling the phenology and limits of hibernation in a sciurid |
title_full |
Factors controlling the phenology and limits of hibernation in a sciurid |
title_fullStr |
Factors controlling the phenology and limits of hibernation in a sciurid |
title_full_unstemmed |
Factors controlling the phenology and limits of hibernation in a sciurid |
title_sort |
factors controlling the phenology and limits of hibernation in a sciurid |
publishDate |
2015 |
url |
http://hdl.handle.net/11122/6196 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic ground squirrel Arctic Urocitellus parryii Alaska |
genre_facet |
Arctic ground squirrel Arctic Urocitellus parryii Alaska |
op_relation |
http://hdl.handle.net/11122/6196 Department of Biology and Wildlife |
_version_ |
1766305099027578880 |