Thermoregulation by captive and free-ranging Egyptian rousette bats (Rousettus aegyptiacus) in South Africa

Show simple item record Barclay, Robert M.R. Jacobs, David S. Harding, Craig T. McKechnie, Andrew E. McCulloch, Stewart D. Markotter, Wanda Paweska, Janusz Brigham, R. Mark 2017-05-02T06:35:51Z 2017-02
dc.description.abstract Many bats, including some small-bodied tropical and sub-tropical Pteropodidae, use torpor to offset energetic constraints. We tested the hypothesis that medium sized (110-160 g) cave-roosting Egyptian rousette bats (Rousettus aegyptiacus) at the southern extent of their range are able to employ torpor. We measured daytime body temperatures (Tb) of nine wild individuals using implanted temperature-sensitive radio-transmitters. The bats roosted in a cave on Table Mountain, Cape Town, South Africa (a typically cool and wet area). Daily mean cave temperature (Tc) ranged between 7 and 12 °C (mean 9.3 °C). All wild individuals exhibited a circadian cycle in Tb, with an average of 37.7 °C upon return from foraging, decreasing to 35.5 °C by mid-day. Before emergence for feeding, Tb increased to about 37 °C. No individual allowed Tb to drop below 34 °C indicating (assuming a threshold temperature of 30 °C) that individuals in this population do not use torpor. Bats were active throughout the day within the roost and metabolic heat production may have contributed to the maintenance of rest phase Tb. Ten individuals implanted with temperature sensitive passive integrated transponder tags were held in captivity at temperatures of 25-30 °C and subjected to food deprivation for 2-3 days. The lowest Tb recorded for any captive individual was 33.4 °C despite losing an average of 10% of their initial body mass. Despite exposure to cool Ta in the cave, and often cold, wet and windy conditions whilst foraging, or substantial food restriction in captive bats, R. aegyptiacus did not resort to using torpor. en_ZA
dc.description.department Mammal Research Institute en_ZA
dc.description.department Medical Virology en_ZA
dc.description.department Zoology and Entomology en_ZA
dc.description.embargo 2018-02-28
dc.description.librarian hb2017 en_ZA
dc.description.sponsorship Grants to DSJ from the University of Cape Town and the South African Research Chair Initiative of the Department of Science and Technology, administered by the NRF (GUN 64798), NSERC Discovery grants to RMRM and RMB, and an NRF grant to AEM, WM and JP (GUN98339). en_ZA
dc.description.uri en_ZA
dc.identifier.citation Barclay, RMR, Jacobs, DS, Harding, CT, McKechnie, AE, McCulloch, SD, Markotter, W, Paweska, J & Brigham, RM 2017, 'Thermoregulation by captive and free-ranging Egyptian rousette bats (Rousettus aegyptiacus) in South Africa', Journal of Mammalogy, vol. 98, no. 2, pp. 572-578. en_ZA
dc.identifier.issn 0022-2372 (online)
dc.identifier.issn 1545-1542 (print)
dc.identifier.other 10.1093/jmammal/gyw234
dc.language.iso en en_ZA
dc.publisher Oxford University Press en_ZA
dc.rights © 2017 American Society of Mammalogists. This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Mammalogy following peer review. The definitive publisher-authenticated version: Journal of Antimicrobial Chemotherapy, vol. 98, no. 2, pp. 572-578, 2017. doi : 10.1093/jmammal/gyw234 is available online at : en_ZA
dc.subject Words en_ZA
dc.subject Bat en_ZA
dc.subject Body temperature (Tb) en_ZA
dc.subject Chiroptera en_ZA
dc.subject Heterothermy en_ZA
dc.subject Pteropodidae en_ZA
dc.subject Radio-telemetry en_ZA
dc.subject Torpor en_ZA
dc.title Thermoregulation by captive and free-ranging Egyptian rousette bats (Rousettus aegyptiacus) in South Africa en_ZA
dc.type Postprint Article en_ZA

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