Phenotypic flexibility of energetics in acclimated Siberian hamsters has a narrower scope in winter than in summer

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Jan S BoratyńskiMichał S Wojciechowski

Abstract

As photoperiod shortens with the approach of winter, small mammals should reduce their energy expenditure to survive periods of food limitation. However, within seasons, animals should balance their energy budgets as abiotic conditions change, sometimes unpredictably; cold spells should increase heat production, while warm spells should do the opposite. Therefore, we addressed specific questions about the possible interactions between seasonal acclimatization and the intra-seasonal phenotypic flexibility of metabolic rate. We hypothesized that phenotypic flexibility in small mammals differs seasonally and is greater in summer than in winter, and predicted that seasonal adjustments in energetics, which are driven by photoperiod, overwhelm the influence of variations in the thermal environment. We measured body mass, basal metabolic rate (BMR), facultative non-shivering thermogenesis (fNST), body temperature, and calculated minimum thermal conductance in Siberian hamsters Phodopus sungorus. Animals were acclimated to winter-like, and then to summer-like conditions and, within each season, were exposed twice, for 3 weeks to 10, 20 or 28 °C. We used differences between values measured after these short acclimation periods as a meas...Continue Reading

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Citations

Apr 13, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·David L SwansonFrançois Vézina
Jun 14, 2017·The Journal of Experimental Biology·Jan S BoratyńskiMichał S Wojciechowski
May 22, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Małgorzata JefimowMichał S Wojciechowski
Jun 27, 2017·Ecology and Evolution·Matthew D WaterhouseMichael A Russello
Apr 11, 2019·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Tommy Norin, Neil B Metcalfe
Oct 19, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Michał S WojciechowskiMałgorzata Jefimow
Apr 2, 2021·Integrative Organismal Biology·D L SwansonS DuBay

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