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Seasonal Hypometabolism in Female Moose

Graesli, Anne Randi and Thiel, Alexandra and Fuchs, Boris and Singh, Navinder and Stenbacka, Fredrik and Ericsson, Göran and Neumann, Wiebke and Arnemo, Jon and Evans, Alina L. (2020). Seasonal Hypometabolism in Female Moose. Frontiers in Ecology and Evolution. 8 , 107 , 1-12
[Research article]

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How animals respond to a changing environment is a key question in ecological research. Animals living at higher latitudes are exposed to pronounced seasonal differences in both climate and in resource availability. Endotherms living in those environments have the ability to maintain a constant high body temperature (Tb), over a wide range of ambient temperatures (T-a). Nonetheless, many endotherms display seasonal shifts in metabolic rate (MR). Here, we studied the annual and circadian cycle of T-b and heart rate (HR) in female moose (Alces alces) in relation to activity and T-a. HR also can be used as a proxy of MR to calculate energy budgets. We deployed biologgers to 12 free-ranging female moose; a temperature sensor in the rumen, a HR logger subcutaneously, and a GPS collar equipped with acceleration and T-a sensors. We documented seasonal differences in T-b, HR and activity of moose, with lower levels during winter and higher values during summer. The highest daily mean T-b and HR were 38.64 degrees C (10 July) and 71.9 beats per minute (bpm; 26 June), whereas the lowest daily mean T-b and HR were 38.03 degrees C (17 March) and 40.5 bpm (6 March). High-resolution T-b and activity data allowed us to detect circadian and ultradian rhythmicity throughout the year. Based on previous calibration studies, MR decreased by 60% from the highest to the lowest point. Our results demonstrate hypometabolism including lower T-b and HR during winter as a strategy to reduce energy expenditure during periods with colder climate and limited availability of resources.

Authors/Creators:Graesli, Anne Randi and Thiel, Alexandra and Fuchs, Boris and Singh, Navinder and Stenbacka, Fredrik and Ericsson, Göran and Neumann, Wiebke and Arnemo, Jon and Evans, Alina L.
Title:Seasonal Hypometabolism in Female Moose
Series Name/Journal:Frontiers in Ecology and Evolution
Year of publishing :2020
Article number:107
Number of Pages:12
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:activity, Alces alces, body temperature, global positioning system, heart rate, metabolic rate, moose, seasonal variation
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Additional ID:
Type of IDID
Web of Science (WoS)000536651200001
ID Code:17220
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:10 Jul 2020 08:10
Metadata Last Modified:15 Jan 2021 19:21

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