Hibernation in the tropics: lessons from a primate

@article{Dausmann2004HibernationIT,
  title={Hibernation in the tropics: lessons from a primate},
  author={Kathrin H. Dausmann and Julian Glos and J{\"o}rg U. Ganzhorn and Gerhard Heldmaier},
  journal={Journal of Comparative Physiology B},
  year={2004},
  volume={175},
  pages={147-155}
}
The Malagasy primate Cheirogaleus medius hibernates in tree holes for 7 months, although ambient temperatures during hibernation rise above 30°C in their natural environment. In a field study we show that during hibernation the body temperature of most lemurs fluctuates between about 10°C and 30°C, closely tracking the diurnal fluctuations of ambient temperature passively. These lemurs do not interrupt hibernation by spontaneous arousals, previously thought to be obligatory for all mammalian… Expand
Energetics of tropical hibernation
TLDR
Tropical hibernation in C. medius is an effective, well-regulated adaptive response to survive unfavourable seasons, and the choice of the hibernaculum does not seem to be of energetic importance. Expand
Underground hibernation in a primate
TLDR
The observation that eastern dwarf lemurs also hibernate, though in self-made underground hibernacula is reported for the first time, showing evidence that a clawless primate is able to bury itself below ground. Expand
Hibernation in Malagasy mouse lemurs as a strategy to counter environmental challenge
TLDR
It is emphasized that hibernation is an important measure to counter environmental challenge for more tropical species than previously thought, including primates, and evidence that tropical hibernation is functionally similar among tropical species is provided. Expand
Yearlong hibernation in a marsupial mammal
  • F. Geiser
  • Biology, Medicine
  • Naturwissenschaften
  • 2007
TLDR
These observations represent the first report on body-fat-fuelled hibernation of up to an entire year and provide new evidence that prolonged hibernation is not restricted to placental mammals living in the cold. Expand
Physiological ecology of cheirogaleid primates: variation in hibernation and torpor
TLDR
A possible explanation for variation in hibernation behavior among Microcebus species and populations is proposed and the amount of energy that can be saved during torpor early in the lean dry season, which is determined by the minimum ambient temperature will be decisive. Expand
Optional strategies for reduced metabolism in gray mouse lemurs
TLDR
These findings provide the first physiological confirmation that free-ranging individuals of M. murinus from the humid evergreen littoral rain forest have the option to utilize short torpor bouts or hibernation under the same conditions as two alternative energy-conserving physiological solutions to environmental constraints. Expand
No energetic benefits from sociality in tropical hibernation
TLDR
It is concluded that sociality during hibernation is not necessarily driven by energetic demands and might even be energetically disadvantageous in tropical species (at least in larger groups), and other factors, like social coherence or ecological and behavioural constraints, may be of greater influence for the evolution of sociality under tropical conditions. Expand
Torpor on Demand: Heterothermy in the Non-Lemur Primate Galago moholi
TLDR
The results support the view that heterothermy in primates evolved before the division of African and Malagasy Strepsirhini, with the possible implication that more primate species than previously thought might still have the potential to call upon this possibility, if the situation necessitates it. Expand
The Dynamics of Body Temperature of the Eastern European Hedgehog (Erinaceus roumanicus) during Winter Hibernation
TLDR
A reliable negative correlation between the duration of bouts and the body temperature is shown, and changes in body temperature in the passive phase (cooling and hibernation) correlate with the ambient temperature. Expand
Opportunistic hibernation by a free-ranging marsupial
TLDR
Examination of torpor patterns in the free-ranging western pygmy-possum shows that torpor use in C. concinnus is strongly influenced by small-scale microclimatic conditions, and the first quantitative data on a marsupial species expressing opportunistic hibernation during winter in the wild is presented. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 41 REFERENCES
Physiology: Hibernation in a tropical primate
TLDR
These findings indicate that arousals are determined by maximum body temperatures and that hypometabolism in hibernating animals is not necessarily coupled to a low body temperature. Expand
Feeding ecology of the hibernating primate Cheirogaleus medius: how does it get so fat?
TLDR
A reduction in locomotor activity as well as a preference for fruit species with a high sugar content enable C. medius to deposit large quantities of fat in a few weeks, suggesting that this small nocturnal lemur hibernates during the dry season from the end of April until October. Expand
Ambient temperatures in hibernacula and their energetic consequences for alpine marmots Marmota marmota
Abstract Temperatures inside natural winter burrows of alpine marmots (Tbur) dropped exponentially throughout the hibernation season from about 12°C in autumn to almost 0°C in spring. LaboratoryExpand
Periodic arousal from hibernation is necessary for initiation of immune responses in ground squirrels.
TLDR
Intracerebroventricular infusions of prostaglandin E(2) provoked arousal from hibernation and induced fever, suggesting that neural signaling pathways that mediate febrile responses are functional during hibernation. Expand
Daily torpor in the gray mouse lemur (Microcebus murinus) in Madagascar: energetic consequences and biological significance
TLDR
All these energy-conserving mechanisms of the nocturnal mouse lemurs, with passive exogenous heating during arousal from torpor, low minimum torpor Tbs, and extended torpor bouts into the activity phase, comprise an important and highly adapted mechanism to minimize energetic costs in response to unfavorable environmental conditions and may play a crucial role for individual fitness. Expand
Daily energy expenditure of the grey mouse lemur (Microcebus murinus): a small primate that uses torpor
TLDR
It is shown that male and female mouse lemurs in the wild enter torpor spontaneously over a wide range of ambient temperatures during the dry season, but not during the rainy season, demonstrating that torpor may not only reflect its impact on the daily energy demands, but involve wider adaptive implications such as water requirements. Expand
Daily torpor and energetics in a tropical mammal, the northern blossom-bat Macroglossus minimus (Megachiroptera)
TLDR
Observations suggest that variables associated with torpor are affected by Ta and that the restriction to tropical areas in M. minimus to some extent may be due to their ability to enter only very shallow daily torpor. Expand
Mammalian hibernation: cellular and molecular responses to depressed metabolism and low temperature.
TLDR
Detailed understanding of hibernation from the molecular to organismal levels should enable the translation of this information to the development of a variety of hypothermic and hypometabolic strategies to improve outcomes for human and animal health. Expand
Metabolism and temperature regulation during daily torpor in the smallest primate, the pygmy mouse lemur (Microcebus myoxinus) in Madagascar
TLDR
Daily body temperature rhythms in M. myoxinus further reduce the energetic costs of daily torpor seen in other species: they extend to unusually low body temperatures and consequently low metabolic rates in torpor, and they employ passive warming to reduce the energy costs of arousal. Expand
The Role of Energy Availability in Mammalian Hibernation: A Cost‐Benefit Approach
TLDR
It is suggested that trade‐offs between the benefits of energy conservation and the physiological costs of metabolic depression can explain both why hibernators periodically arouse from torpor and why they should use available energy to minimize the depth and duration of their torpor bouts. Expand
...
1
2
3
4
5
...