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Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs

Hibernation and daily torpor (heterothermy) allow endotherms to cope with demanding environmental conditions. The depth and duration of torpor bouts vary considerably between tropical and temperate climates, and tropical hibernators manage to cope with a wider spectrum of ambient temperature (T(a))...

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Autores principales: Dausmann, Kathrin H., Levesque, Danielle L., Wein, Jens, Nowack, Julia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7270353/
https://www.ncbi.nlm.nih.gov/pubmed/32547412
http://dx.doi.org/10.3389/fphys.2020.00522
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author Dausmann, Kathrin H.
Levesque, Danielle L.
Wein, Jens
Nowack, Julia
author_facet Dausmann, Kathrin H.
Levesque, Danielle L.
Wein, Jens
Nowack, Julia
author_sort Dausmann, Kathrin H.
collection PubMed
description Hibernation and daily torpor (heterothermy) allow endotherms to cope with demanding environmental conditions. The depth and duration of torpor bouts vary considerably between tropical and temperate climates, and tropical hibernators manage to cope with a wider spectrum of ambient temperature (T(a)) regimes during heterothermy. As cycles in T(a) can have profound effects on activity and torpor patterns as well as energy expenditure, we examined how these characteristics are affected by daily fluctuating versus constant T(a) in a tropical hibernator, the lesser hedgehog tenrec (Echinops telfairi). Throughout the study, regardless of season, the tenrecs became torpid every day. In summer, E. telfairi used daily fluctuations in T(a) to passively rewarm from daily torpor, which led to synchrony in the activity phases and torpor bouts between individuals and generally decreased energy expenditure. In contrast, animals housed at constant T(a) showed considerable variation in timing and they had to invest more energy through endogenous heat production. During the hibernation season (winter) E. telfairi hibernated for several months in constant, as well as in fluctuating T(a) and, as in summer, under fluctuating T(a) arousals were much more uniform and showed less variation in timing compared to constant temperature regimes. The timing of torpor is not only important for its effective use, but synchronization of activity patterns could also be essential for social interactions, and successful foraging bouts. Our results highlight that T(a) cycles can be an effective zeitgeber for activity and thermoregulatory rhythms throughout the year and that consideration should be given to the choice of temperature regime when studying heterothermy under laboratory conditions.
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spelling pubmed-72703532020-06-15 Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs Dausmann, Kathrin H. Levesque, Danielle L. Wein, Jens Nowack, Julia Front Physiol Physiology Hibernation and daily torpor (heterothermy) allow endotherms to cope with demanding environmental conditions. The depth and duration of torpor bouts vary considerably between tropical and temperate climates, and tropical hibernators manage to cope with a wider spectrum of ambient temperature (T(a)) regimes during heterothermy. As cycles in T(a) can have profound effects on activity and torpor patterns as well as energy expenditure, we examined how these characteristics are affected by daily fluctuating versus constant T(a) in a tropical hibernator, the lesser hedgehog tenrec (Echinops telfairi). Throughout the study, regardless of season, the tenrecs became torpid every day. In summer, E. telfairi used daily fluctuations in T(a) to passively rewarm from daily torpor, which led to synchrony in the activity phases and torpor bouts between individuals and generally decreased energy expenditure. In contrast, animals housed at constant T(a) showed considerable variation in timing and they had to invest more energy through endogenous heat production. During the hibernation season (winter) E. telfairi hibernated for several months in constant, as well as in fluctuating T(a) and, as in summer, under fluctuating T(a) arousals were much more uniform and showed less variation in timing compared to constant temperature regimes. The timing of torpor is not only important for its effective use, but synchronization of activity patterns could also be essential for social interactions, and successful foraging bouts. Our results highlight that T(a) cycles can be an effective zeitgeber for activity and thermoregulatory rhythms throughout the year and that consideration should be given to the choice of temperature regime when studying heterothermy under laboratory conditions. Frontiers Media S.A. 2020-05-28 /pmc/articles/PMC7270353/ /pubmed/32547412 http://dx.doi.org/10.3389/fphys.2020.00522 Text en Copyright © 2020 Dausmann, Levesque, Wein and Nowack. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Physiology
Dausmann, Kathrin H.
Levesque, Danielle L.
Wein, Jens
Nowack, Julia
Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title_full Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title_fullStr Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title_full_unstemmed Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title_short Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
title_sort ambient temperature cycles affect daily torpor and hibernation patterns in malagasy tenrecs
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7270353/
https://www.ncbi.nlm.nih.gov/pubmed/32547412
http://dx.doi.org/10.3389/fphys.2020.00522
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