Abstract
Photoperiod and dietary lipids both influence thermal physiology and the pattern of torpor of heterothermic mammals. The aim of the present study was to test the hypothesis that photoperiod-induced physiological changes are linked to differences in tissue fatty acid composition of deer mice, Peromyscus maniculatus (∼18-g body mass). Deer mice were acclimated for >8 weeks to one of three photoperiods (LD, light/dark): LD 8:16 (short photoperiod), LD 12:12 (equinox photoperiod), and LD 16:8 (long photoperiod). Deer mice under short and equinox photoperiods showed a greater occurrence of torpor than those under long photoperiods (71, 70, and 14%, respectively). The duration of torpor bouts was longest in deer mice under short photoperiod (9.3 ± 2.6 h), intermediate under equinox photoperiod (5.1 ± 0.3 h), and shortest under long photoperiod (3.7 ± 0.6 h). Physiological differences in torpor use were associated with significant alterations of fatty acid composition in ∼50% of the major fatty acids from leg muscle total lipids, whereas white adipose tissue fatty acid composition showed fewer changes. Our results provide the first evidence that physiological changes due to photoperiod exposure do result in changes in lipid composition in the muscle tissue of deer mice and suggest that these may play a role in survival of low body temperature and metabolic rate during torpor, thus, enhancing favourable energy balance over the course of the winter.
Abbreviations
- MUFA:
-
monounsaturated fatty acids
- PUFA:
-
polyunsaturated fatty acids
- SFA:
-
saturated fatty acids
- T a :
-
air temperature
- T b :
-
body temperature
- UFA:
-
unsaturated fatty acids
- \({\mathop {\text{V}}\limits^{\text{.}} }{\text{O}}_{{\text{2}}} \) :
-
rate of oxygen consumption
- WAT:
-
white adipose tissue
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Acknowledgement
We thank Rebecca Drury for technical help. The Alexander von Humboldt Foundation and the Australian Research Council supported the work. Animal housing and experiments were conducted according to the standards of the University of Washington and National Institutes of Health (NIH) animal care guidelines.
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Geiser, F., McAllan, B.M., Kenagy, G.J. et al. Photoperiod affects daily torpor and tissue fatty acid composition in deer mice. Naturwissenschaften 94, 319–325 (2007). https://doi.org/10.1007/s00114-006-0193-z
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DOI: https://doi.org/10.1007/s00114-006-0193-z