Thermal relations of metabolic rate reduction in a hibernating marsupial

The American Journal of Physiology
X SongFritz Geiser

Abstract

We tested whether the reduction of metabolic rate (MR) in hibernating Cercartetus nanus (Marsupialia, 36 g) is better explained by the reduction of body temperature (Tb), the differential (delta T) between Tb and air temperature (Ta), or thermal conductance (C). Above the critical Ta during torpor (Ttc) of 4.8 +/- 0.7 degrees C where the Tb was not regulated, the steady-state MR was an exponential function of Tb (r2 = 0.92), and the overall Q10 was 3.3. However, larger Q10 values were observed at high Tb values during torpor, particularly within the thermoneutral zone (Q10 = 9.5), whereas low Q10 values were observed below Tb 20 degrees C (Q10 = 1.9). The delta T did not change over Ta 5-20 degrees C, although MR fell, and therefore the two variables were not correlated. Below the Ttc, Tb was regulated at 6.1 +/- 1.0 degrees C and MR increased proportionally to delta T. Our study suggests that MR in torpid C. nanus is largely determined by temperature effects and metabolic inhibition. In contrast, delta T explains MR only below the Ttc and C appears to affect MR only indirectly via changes of Tb, suggesting that delta T and C play only a secondary role in MR reduction during hibernation.

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Citations

Apr 25, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Sylvain GiroudMartine Perret
Aug 16, 2014·Biological Reviews of the Cambridge Philosophical Society·Thomas Ruf, Fritz Geiser
Mar 16, 2004·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Alexander S KauffmanIrving Zucker
Feb 24, 2004·Annual Review of Physiology·Fritz Geiser
Jun 3, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Clare Stawski, Fritz Geiser
Mar 30, 2017·Temperature : Multidisciplinary Biomedical Journal·Artiom BondarencoFritz Geiser
Jul 29, 2017·Biological Reviews of the Cambridge Philosophical Society·Michel GenoudRobert D Martin
Jan 5, 2018·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Franz LangerJoanna Fietz
Apr 25, 2012·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Michael J SheriffBrian M Barnes
Apr 23, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Julia NowackFritz Geiser
Jun 4, 2017·The Journal of Experimental Biology·Steven J SwoapFritz Geiser
Jul 18, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·C L Buck, B M Barnes
Jan 13, 2021·Proceedings. Biological Sciences·Stephanie Reher, Kathrin H Dausmann
Jan 29, 2021·The Journal of Experimental Biology·Barry van JaarsveldAndrew E McKechnie
Mar 23, 2005·The Journal of Experimental Biology·Ralf Elvert, Gerhard Heldmaier
Dec 16, 2006·The Journal of Experimental Biology·Andrew E McKechnieBarry G Lovegrove

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