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Seasonal Variations in Energy Turnover and Body Temperature in Free-Living Edible Dormice, Glis glis

  • Joanna Fietz
  • Jutta Schmid
  • John R. Speakman
Chapter

Abstract

Edible dormice (Glis glis) face low food availability after emergence from hibernation, and during years when there is no seed production from their main feeding trees. In this field study we aimed to investigate seasonal changes of energy turnover and body temperature (T b) in edible dormice during periods of high and low food availability, to understand energy saving strategies, besides the use of hibernation and torpor. We therefore measured daily energy expenditure of nine adults using the doubly labelled water and resting metabolic rate of 20 euthermic individuals with portable gas analysers. Additionally, we analysed T b patterns of 118 individuals during years of high and low food availability. All measurements were carried out in the field during the active months of edible dormice between 1996 and 2006 in south western Germany. Results of this study demonstrate that energy turnover and T b in edible dormice vary markedly over their active season and among years. Variations of food intake and the heat increment of feeding are likely to cause a substantial part of these variations together with the reactivation of organs that are atrophied during hibernation. T b patterns strongly suggest that edible dormice reduce their T b to save energy during periods of limited food supply.

Keywords

Late Summer Early Summer Torpor Bout Energy Turnover Doubly Label Water 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

APE

Atom percent excess

DEE

Daily energy expenditure

DLW

Doubly labelled water

HE

Hohenentringen

HL

Hagelloch

RMR

Resting metabolic rate

Ta

Ambient temperature

Tb

Body temperature

Tnest

Nest box temperature

TNZ

Thermoneutral zone

Notes

Acknowledgments

W. Schlund, F. Scharfe, M. Regelmann, T. Kager and S. Schauer helped in many ways with this field project. Financial support provided by the Margarete von Wrangell Programme, the German Research Foundation (DFG, FI 831/3-1; 831/3-2), and the German Wildlife Foundation, all to JF, made this study possible. Our experiments were conducted under licence from the nature conservancy and the animal experiment department of the Regierungspräsidium Tübingen. Paula Redman and Peter Thomson provided technical assistance for analysis of the isotopes for DLW measurements.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Joanna Fietz
    • 1
    • 2
  • Jutta Schmid
    • 2
  • John R. Speakman
    • 3
  1. 1.Animal Husbandry and Animal BreedingUniversity of HohenheimStuttgartGermany
  2. 2.Department of Experimental EcologyUniversity of UlmUlmGermany
  3. 3.Institute of Biological and Environmental SciencesUniversity of AberdeenAberdeenUK

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