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Hibernation and daily torpor minimize mammalian extinctions
Naturwissenschaften, 2009Small mammals appear to be less vulnerable to extinction than large species, but the underlying reasons are poorly understood. Here, we provide evidence that almost all (93.5%) of 61 recently extinct mammal species were homeothermic, maintaining a constant high body temperature and thus energy expenditure, which demands a high intake of food, long ...
Geiser, Fritz +1 more
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Seasonality of Daily Torpor and Hibernation
2021The weather of most geographical regions changes substantially with the seasons. Therefore, alterations in the thermal environment, rainfall and other environmental variables require a responsive adjustment of the physiology of animals to enable survival.
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Naloxone inhibition of stress-induced daily torpor
Life Sciences, 1984Peromyscus maniculatus, deermice , were induced into daily torpor by restricting food to one-half daily ration. Intraperitoneal injection of naloxone (20 mg/kg) into mice habituated to daily IP injections of saline inhibited or modified the expression of daily torpor.
E B, Pivorun, M G, Tannenbaum
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Magnitude of food overabundance affects expression of daily torpor
Physiology and Behavior, 2015Many small mammal species use torpor as a strategy for reducing energy expenditure in winter. Some rodent hibernators also hoard food to provide reserves of energy, and individuals with large hoards express less torpor than those with smaller reserves.
Chihiro Koshimoto +2 more
exaly +3 more sources
Daily torpor in Peromyscus leucopus on an adequate diet
Comparative Biochemistry and Physiology A, Comparative Physiology, 1975Abstract 1. 1. Seventeen mice were tested for the occurrence of torpor in the presence of excess food over periods of 6–30 days at ambient temperatures of 13-12°C. 2. 2. Seven animals displayed regularly torpor, and four displayed sporadic episodes of torpor.
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Adenosine, AMP, and Daily Torpor
2012When calorically restricted at cool ambient temperatures, mice conserve energy by entering torpor, during which metabolic rate (MR), core body temperature (T b), heart rate (HR), and locomotor activity (LMA) decrease. Others have suggested that injection of adenosine monophosphate (AMP) mimics the torpor pathway.
Steven J. Swoap, Benjamin Iliff, Son Le
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Daily torpor in hamsters (Rodentia, Cricetinae)
Russian Journal of Ecology, 2012Study of ecological adaptations, including torpor, related to survival through the adverse conditions of the autumn-winter season is important for both the estimation of the body reserves in mammals in general and the search for the ways to increase the cold-stress resistance in humans. The changes in the body temperature during the period from October
M. V. Ushakova +3 more
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An energetic model of daily torpor in endotherms
Journal of Theoretical Biology, 1986A model of daily torpor in endotherms is presented. We assume that torpor behavior has selective value because of the potential savings to be made in energy expenditure when body temperature is reduced. It is noted that whereas the energy savings made while in torpor may be proportional to approximately the two-thirds power of body weight, the energy ...
John Prothero, Klaus Dieter Jürgens
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Daily torpor in the absence of the suprachiasmatic nucleus in Siberian hamsters
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1992Siberian hamsters express torpor spontaneously after several weeks of exposure to short days. In long days, torpor is expressed only when food intake is restricted. Hamsters maintained in a long photoperiod (16 h light/day) at 15 degrees C expressed daily torpor during food restriction both before and after bilateral ablation of the suprachiasmatic ...
N F, Ruby, I, Zucker
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Hibernation and daily torpor in an armadillo, the pichi (Zaedyus pichiy)
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2007Hibernation and daily torpor are physiological strategies to cope with energetic challenges that occur in many mammalian and avian taxa, but no reliable information exists about daily torpor or hibernation for any xenarthran. Our objective was to determine whether the pichi (Zaedyus pichiy), a small armadillo (Xenarthra, Dasypodidae) that inhabits arid
Mariella, Superina, Patrice, Boily
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