Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears
International audience Abstract Background Despite centuries of research, debate remains on the scaling of metabolic rate to mass especially for intraspecific cases. The high variation of body mass within brown bears presents a unique opportunity to study the intraspecific effects of body mass on ph...
Published in: | Frontiers in Zoology |
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fthalin2p3:oai:HAL:hal-04283678v1 2024-05-12T08:12:15+00:00 Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears Evans, Alina Fuchs, Boris Singh, Navinder Thiel, Alexandra Giroud, Sylvain Blanc, Stephane Laske, Timothy Frobert, Ole Friebe, Andrea Swenson, Jon Arnemo, Jon Institut Pluridisciplinaire Hubert Curien (IPHC) Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) 2023-12 https://hal.science/hal-04283678 https://hal.science/hal-04283678/document https://hal.science/hal-04283678/file/12983_2023_Article_501.pdf https://doi.org/10.1186/s12983-023-00501-3 en eng HAL CCSD BioMed Central info:eu-repo/semantics/altIdentifier/doi/10.1186/s12983-023-00501-3 hal-04283678 https://hal.science/hal-04283678 https://hal.science/hal-04283678/document https://hal.science/hal-04283678/file/12983_2023_Article_501.pdf doi:10.1186/s12983-023-00501-3 info:eu-repo/semantics/OpenAccess ISSN: 1742-9994 Frontiers in Zoology https://hal.science/hal-04283678 Frontiers in Zoology, 2023, 20 (1), pp.27. ⟨10.1186/s12983-023-00501-3⟩ [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2023 fthalin2p3 https://doi.org/10.1186/s12983-023-00501-3 2024-04-17T15:23:58Z International audience Abstract Background Despite centuries of research, debate remains on the scaling of metabolic rate to mass especially for intraspecific cases. The high variation of body mass within brown bears presents a unique opportunity to study the intraspecific effects of body mass on physiological variables. The amplitude of metabolic rate reduction in hibernators is dependent on body mass of the species. Small hibernators have high metabolic rates when euthermic but experience a drastic decrease in body temperature during torpor, which is necessary to reach a very low metabolic rate. Conversely, large hibernators, such as the brown bear ( Ursus arctos ), show a moderate decrease in temperature during hibernation, thought to be related to the bear’s large size. We studied body mass, abdominal body temperature, heart rate, and accelerometer-derived activity from 63 free-ranging brown bears (1–15 years old, 15–233 kg). We tested for relationships between body mass and body temperature, heart rate, and hibernation duration. Results The smallest individuals maintained lower body temperatures during hibernation, hibernated longer, and ended hibernation later than large bears. Unlike body temperature, winter heart rates were not associated with body mass. In summer, the opposite pattern was found, with smaller individuals having higher body temperature and daytime heart rates. Body mass was associated with body temperature in the winter hypometabolic state, even in a large hibernating mammal. Smaller bears, which are known to have higher thermal conductance, reached lower body temperatures during hibernation. During summer, smaller bears had higher body temperatures and daytime heart rates, a phenomenon not previously documented within a single mammalian species. Conclusion We conclude that the smallest bears hibernated more deeply and longer than large bears, likely from a combined effect of basic thermodynamics, the higher need for energy savings, and a lower cost of warming up a smaller body. Article in Journal/Newspaper Ursus arctos HAL-IN2P3 (Institut national de physique nucléaire et de physique des particules) Frontiers in Zoology 20 1 |
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HAL-IN2P3 (Institut national de physique nucléaire et de physique des particules) |
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fthalin2p3 |
language |
English |
topic |
[SDV]Life Sciences [q-bio] |
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[SDV]Life Sciences [q-bio] Evans, Alina Fuchs, Boris Singh, Navinder Thiel, Alexandra Giroud, Sylvain Blanc, Stephane Laske, Timothy Frobert, Ole Friebe, Andrea Swenson, Jon Arnemo, Jon Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
topic_facet |
[SDV]Life Sciences [q-bio] |
description |
International audience Abstract Background Despite centuries of research, debate remains on the scaling of metabolic rate to mass especially for intraspecific cases. The high variation of body mass within brown bears presents a unique opportunity to study the intraspecific effects of body mass on physiological variables. The amplitude of metabolic rate reduction in hibernators is dependent on body mass of the species. Small hibernators have high metabolic rates when euthermic but experience a drastic decrease in body temperature during torpor, which is necessary to reach a very low metabolic rate. Conversely, large hibernators, such as the brown bear ( Ursus arctos ), show a moderate decrease in temperature during hibernation, thought to be related to the bear’s large size. We studied body mass, abdominal body temperature, heart rate, and accelerometer-derived activity from 63 free-ranging brown bears (1–15 years old, 15–233 kg). We tested for relationships between body mass and body temperature, heart rate, and hibernation duration. Results The smallest individuals maintained lower body temperatures during hibernation, hibernated longer, and ended hibernation later than large bears. Unlike body temperature, winter heart rates were not associated with body mass. In summer, the opposite pattern was found, with smaller individuals having higher body temperature and daytime heart rates. Body mass was associated with body temperature in the winter hypometabolic state, even in a large hibernating mammal. Smaller bears, which are known to have higher thermal conductance, reached lower body temperatures during hibernation. During summer, smaller bears had higher body temperatures and daytime heart rates, a phenomenon not previously documented within a single mammalian species. Conclusion We conclude that the smallest bears hibernated more deeply and longer than large bears, likely from a combined effect of basic thermodynamics, the higher need for energy savings, and a lower cost of warming up a smaller body. |
author2 |
Institut Pluridisciplinaire Hubert Curien (IPHC) Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Evans, Alina Fuchs, Boris Singh, Navinder Thiel, Alexandra Giroud, Sylvain Blanc, Stephane Laske, Timothy Frobert, Ole Friebe, Andrea Swenson, Jon Arnemo, Jon |
author_facet |
Evans, Alina Fuchs, Boris Singh, Navinder Thiel, Alexandra Giroud, Sylvain Blanc, Stephane Laske, Timothy Frobert, Ole Friebe, Andrea Swenson, Jon Arnemo, Jon |
author_sort |
Evans, Alina |
title |
Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
title_short |
Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
title_full |
Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
title_fullStr |
Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
title_full_unstemmed |
Body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
title_sort |
body mass is associated with hibernation length, body temperature, and heart rate in free-ranging brown bears |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04283678 https://hal.science/hal-04283678/document https://hal.science/hal-04283678/file/12983_2023_Article_501.pdf https://doi.org/10.1186/s12983-023-00501-3 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
ISSN: 1742-9994 Frontiers in Zoology https://hal.science/hal-04283678 Frontiers in Zoology, 2023, 20 (1), pp.27. ⟨10.1186/s12983-023-00501-3⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12983-023-00501-3 hal-04283678 https://hal.science/hal-04283678 https://hal.science/hal-04283678/document https://hal.science/hal-04283678/file/12983_2023_Article_501.pdf doi:10.1186/s12983-023-00501-3 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1186/s12983-023-00501-3 |
container_title |
Frontiers in Zoology |
container_volume |
20 |
container_issue |
1 |
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1798834568327856128 |