Thermal biology, torpor and behaviour in sugar gliders: a laboratory-field comparison

@article{Geiser2007ThermalBT,
  title={Thermal biology, torpor and behaviour in sugar gliders: a laboratory-field comparison},
  author={Fritz Geiser and Joanne C Holloway and Gerhard K{\"o}rtner},
  journal={Journal of Comparative Physiology B},
  year={2007},
  volume={177},
  pages={495-501}
}
Most studies on animal physiology and behaviour are conducted in captivity without verification that data are representative of free-ranging animals. We provide the first quantitative comparison of daily torpor, thermal biology and activity patterns, conducted on two groups of sugar gliders (Petaurus breviceps, Marsupialia) exposed to similar thermal conditions, one in captivity and the other in the field. Our study shows that activity in captive gliders in an outdoor aviary is restricted to… 

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References

SHOWING 1-10 OF 38 REFERENCES
Torpor and activity patterns in free-ranging sugar gliders Petaurus breviceps (Marsupialia)
TLDR
It is shown that cold or wet conditions curtail foraging in wild sugar gliders and that they employ daily torpor regularly during adverse weather, which suggests that minimisation of energy loss by the use of torpor in sugar glider is pivotal for their survival in the wild.
Intraspecific differences in behaviour and physiology: effects of captive breeding on patterns of torpor in feathertail gliders
TLDR
It is shown that morphology, behaviour and physiology can be strongly affected by breeding in or acclimation to captivity, and data from captive-bred individuals should only be extrapolated to the field with caution.
Thermoregulatory ecology of a solitary bat, Myotis evotis, roosting in rock crevices
TLDR
The interaction between thermoregulatory behaviour and roost choice in reproductive female Western Long-Eared Bats, Myotis evotis (H. Allen), roosting solitarily in natural rock crevices is investigated, showing adaptive, but differ from those of other temperate-zone insectivorous bats that have been studied in the past.
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.
Do Patterns of Torpor Differ between Free-ranging and Captive Mammals and Birds?
TLDR
Comparison of whether patterns of torpor of several mammals and birds differ between the laboratory and field suggests that laboratory studies are likely to underestimate use and depth oftorpor in the wild and thus may underestimate its impact on energy expenditure and survival.
Ecological, Physiological, and Biochemical Aspects of Torpor in Mammals and Birds
TLDR
This work has shown that torpor in birds and mammals is polyphyletic, and represents an advanced form of thermoregulation rather than a reversion to primitive poikilothermy, and is also being deployed by those which inhabit the subtropical and tropical climates.
Metabolic rate and body temperature reduction during hibernation and daily torpor.
  • F. Geiser
  • Biology
    Annual review of physiology
  • 2004
TLDR
The comparative analysis provided here suggests that MR reduction depends on patterns of torpor used, the state of tor porpor, and body mass, which in turn affects metabolic inhibition and energy conservation.
Hibernation versus Daily Torpor in Mammals and Birds: Physiological Variables and Classification of Torpor Patterns
TLDR
Comparisons of several physiological variables appear to justify a distinction between the two torpor patterns, but of all variables tested, only the frequency distributions of maximum torpor bout duration and the minimum V̇o2 showed a clear gap between daily heterotherms and hibernators.
Thermoregulation and Torpor in the Sugar Glider, Petaurus Breviceps (Marsupialia:Petauridae).
TLDR
Sugar gliders from south-eastern Australia regulate their body temperature at 36.3 deg C at ambient temperatures less than 31 deg and torpor may be used to overcome short-term reductions in winter food supplies.
The energetic cost of arousal from torpor in the marsupial Sminthopsis macroura : benefits of summer ambient temperature cycles
TLDR
The total cost of all three phases of torpor (entry, maintenance and arousal) was almost halved when animals were exposed to an ambient heating cycle from 15 °C to 25‬C over a 24-h period, and may represent an important energetic aid to free-ranging animals.
...
1
2
3
4
...