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Associations between resting, activity, and daily metabolic rate in free-living endotherms: No universal rule in birds and mammals


Portugal, SJ and Green, JA and Halsey, LG and Arnold, W and Careau, V and Dann, P and Frappell, PB and Gremillet, D and Handrich, Y and Martin, GR and Ruf, T and Guillemette, MM and Butler, PJ, Associations between resting, activity, and daily metabolic rate in free-living endotherms: No universal rule in birds and mammals, Physiological and Biochemical Zoology, 89, (3) pp. 251-261. ISSN 1522-2152 (2016) [Refereed Article]


Copyright Statement

2016 by The University of Chicago

DOI: doi:10.1086/686322


Energy management models provide theories and predictions for how animals manage their energy budgets within their energetic constraints, in terms of their resting metabolic rate (RMR) and daily energy expenditure (DEE). Thus, uncovering what associations exist between DEE and RMR is key to testing these models. Accordingly, there is considerable interest in the relationship between DEE and RMR at both inter- and intraspecific levels. Interpretation of the evidence for particular energy management models is enhanced by also considering the energy spent specifically on costly activities (activity energy expenditure [AEE] = DEE − RMR). However, to date there have been few intraspecific studies investigating such patterns. Our aim was to determine whether there is a generality of intraspecific relationships among RMR, DEE, and AEE using long-term data sets for bird and mammal species. For mammals, we use minimum heart rate (fH), mean fH, and activity fH as qualitative proxies for RMR, DEE, and AEE, respectively. For the birds, we take advantage of calibration equations to convert fH into rate of oxygen consumption in order to provide quantitative proxies for RMR, DEE, and AEE. For all 11 species, the DEE proxy was significantly positively correlated with the RMR proxy. There was also evidence of a significant positive correlation between AEE and RMR in all four mammal species but only in some of the bird species. Our results indicate there is no universal rule for birds and mammals governing the relationships among RMR, AEE, and DEE. Furthermore, they suggest that birds tend to have a different strategy for managing their energy budgets from those of mammals and that there are also differences in strategy between bird species. Future work in laboratory settings or highly controlled field settings can tease out the environmental and physiological processes contributing to variation in energy management strategies exhibited by different species.

Item Details

Item Type:Refereed Article
Keywords:energy management model, energy expenditure, heart rate, intraspecific, oxygen consumption
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal physiological ecology
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Frappell, PB (Professor Peter Frappell)
ID Code:117691
Year Published:2016
Web of Science® Times Cited:34
Deposited By:Zoology
Deposited On:2017-06-23
Last Modified:2017-11-01
Downloads:228 View Download Statistics

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