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Title: Photoperiod affects daily torpor and tissue fatty acid composition in deer mice
Contributor(s): Geiser, Fritz  (author)orcid ; McAllan, Bronwyn Marie (author); Kenagy, GJ (author); Hiebert, SM (author)
Publication Date: 2006
DOI: 10.1007/s00114-006-0193-z
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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" (~18g 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.
Publication Type: Journal Article
Source of Publication: Naturwissenschaften, 94(4), p. 319-325
Publisher: Springer
Place of Publication: Berlin, Germany
ISSN: 1432-1904
Field of Research (FOR): 060604 Comparative Physiology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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School of Environmental and Rural Science

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