Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/51768
Title: Phoenix from the Ashes: Fire, Torpor, and the Evolution of Mammalian Endothermy
Contributor(s): Geiser, Fritz  (author)orcid ; Stawski, Clare  (author); Wacker, Chris B  (author); Nowack, Julia  (author)
Publication Date: 2017-11-02
Open Access: Yes
DOI: 10.3389/fphys.2017.00842
Handle Link: https://hdl.handle.net/1959.11/51768
Abstract: The evolution of endothermy in mammals and birds has been widely debated. Endothermy is characterized by high endogenous heat production via combustion of metabolic fuels. This differs from ectothermy in most living organisms, which generally do not produce substantial amounts of internal heat for thermoregulation (Tattersall et al., 2012; Withers et al., 2016). Endogenous heat production is energetically very costly. In comparison to ectothermic terrestrial vertebrates, namely the amphibians and reptiles, the minimum metabolic rate (MR) of normothermic or homeothermic (high constant body temperature, Tb) animals at rest is about 4–8-fold higher in the endotherms. This difference is even more pronounced at low ambient temperatures (Ta) at which the Tb of ectotherms follows Ta, and the MR decreases to even lower levels. In contrast, the Tb of homeothermic endotherms remains high and constant over a wide range of Ta. Therefore, to compensate for increased heat loss at low Ta, MR of especially small mammals and birds must increase substantially and can be 100-fold or more of that in ectotherms (Bartholomew, 1982). Of course this high MR requires a substantial uptake of food and in endotherms much of this chemical energy is simply converted into heat for thermoregulation rather than growth or reproduction as in ectotherms.
Publication Type: Journal Article
Source of Publication: Frontiers in Physiology, v.8, p. 1-7
Publisher: Frontiers Research Foundation
Place of Publication: Switzerland
ISSN: 1664-042X
Fields of Research (FoR) 2020: 310912 Comparative physiology
310907 Animal physiological ecology
Socio-Economic Objective (SEO) 2020: 180606 Terrestrial biodiversity
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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