Increased winter survival by reducing energy expenditure in adult animals is often viewed as the primary function of torpor. However, torpor has many other functions that ultimately increase the survival of heterothermic mammals and birds. In this review, we summarize new findings revealing that animals use torpor to cope with the conditions during and after natural disasters, including fires, storms, and heat waves. Furthermore, we suggest that torpor, which also prolongs longevity and was likely crucial for survival of mammals during the time of the dinosaur extinctions, will be advantageous in a changing world. Climate change is assumed to lead to an increase in the occurrence and intensity of climatic disasters, such as those listed above and also abnormal floods, droughts, and extreme temperatures. The opportunistic use of torpor, found in many heterothermic species, will likely enhance survival of these challenges, because these species can reduce energy and foraging requirements. However, many strictly seasonal hibernators will likely face the negative consequences of the predicted increase in temperature, such as range contraction. Overall, available data suggest that opportunistic heterotherms with their flexible energy requirements have an adaptive advantage over homeotherms in response to unpredictable conditions.
Details
Title
More functions of torpor and their roles in a changing world
Authors
Julia Nowack (Author) - University of New England
Clare Stawski (Author) - University of New England
Fritz Geiser (Author) - University of New England
Publication details
Journal of Comparative Physiology B, Vol.187(5-6), pp.889-897
Publisher
Springer
Date published
2017
DOI
10.1007/s00360-017-1100-y
ISSN
1432-136X; 0174-1578
PMID
28432393; PMC5486538
Copyright note
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted
use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Organisation Unit
University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering