Hibernation by tree-roosting bats.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Christopher Turbill, Fritz Geiser

Abstract

In summer, long-eared bats (Nyctophilus spp.) roost under bark and in tree cavities, where they appear to benefit from diurnal heating of roosts. In contrast, hibernation is thought to require a cool stable temperature, suggesting they should prefer thermally insulated tree cavities during winter. To test this prediction, we quantified the winter thermoregulatory physiology and ecology of hibernating tree-roosting bats, Nyctophilus geoffroyi and N. gouldi in the field. Surprisingly, bats in winter continued to roost under exfoliating bark (65%) on the northern, sunny side of trees and in shallow tree cavities (35%). Despite passive re-warming of torpid bats by 10-20 degrees C per day, torpor bouts lasted up to 15 days, although shorter bouts were also common. Arousals occurred more frequently and subsequent activity lasted longer on warmer nights, suggesting occasional winter foraging. We show that, because periodic arousals coincide with maximum roost temperatures, when costs of rewarming and normothermic thermoregulation are minimal, exposure to a daily temperature cycle could largely reduce energy expenditure during hibernation. Our study provides further evidence that models of torpor patterns and energy expenditure from hi...Continue Reading

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Citations

Dec 30, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Clare StawskiFritz Geiser
Aug 18, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Jian-Nan Liu, William H Karasov
Nov 30, 2011·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Paul R Hope, Gareth Jones
Aug 31, 2013·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Artiom BondarencoFritz Geiser
Jun 21, 2011·Biological Reviews of the Cambridge Philosophical Society·Barry Gordon Lovegrove
Feb 21, 2013·International Journal of Biometeorology·Martin U GrüeblerBeat Naef-Daenzer
Aug 16, 2014·Biological Reviews of the Cambridge Philosophical Society·Thomas Ruf, Fritz Geiser
Apr 11, 2012·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·James M TurnerFritz Geiser
Nov 23, 2013·Environment International·Sara BayatSusan C Wilson
Mar 6, 2015·Proceedings. Biological Sciences·Eran LevinNoga Kronfeld-Schor
Aug 10, 2016·Journal of Thermal Biology·Anna C DotyFritz Geiser
Mar 31, 2017·The Journal of Experimental Biology·Tegan K DouglasPhilip C Withers
Nov 21, 2014·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Shannon E CurrieFritz Geiser
Jun 3, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Clare Stawski, Fritz Geiser
Sep 5, 2020·Frontiers in Zoology·Natália MartínkováJan Zima
Jun 18, 2020·Frontiers in Physiology·Kathrin H DausmannJulia Nowack
Mar 30, 2017·Temperature : Multidisciplinary Biomedical Journal·Artiom BondarencoFritz Geiser
May 25, 2012·The Journal of Experimental Biology·Kristin A Jonasson, Craig K R Willis
Jan 18, 2014·The Journal of Experimental Biology·Shannon E CurrieFritz Geiser
Sep 25, 2021·Frontiers in Zoology·Riley F BernardGary F McCracken

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