Torpor in an Andean Hummingbird: Its Ecological Significance

@article{Carpenter1974TorporIA,
  title={Torpor in an Andean Hummingbird: Its Ecological Significance},
  author={F. Lynn Carpenter},
  journal={Science},
  year={1974},
  volume={183},
  pages={545 - 547}
}
  • F. Carpenter
  • Published 8 February 1974
  • Biology, Medicine
  • Science
Field studies on an Andean hummingbird showed that nocturnal torpor occurs more frequently and lasts longer in the winter. Energy depletion does not seem to cause this yearly torpor cycle, and a photoperiodically controlled rhythm that enables the birds to automatically conserve energy in early evening for possible metabolic expenditures required later in the winter night is suggested. 
A new function for torpor: fat conservation in a wild migrant hummingbird
TLDR
Monitoring of the daily energy state of hummingbirds in the field showed that migrant hummingbirds may use torpor when they are very fat and not presently energetically stressed, indicating a mechanism to conserve the energy stored for later use on migration. Expand
The Impact of Social Interactions on Torpor Use in Hummingbirds
TLDR
Measurements of metabolic rate and fat deposition were made on a three-species hummingbird guild in southeastern Arizona to determine if the energetic advantage gained by a dominant territorial species over subordinate competitors resulted in less frequent use of torpor, and showed that L. clemenciae was able to store enough fat during the day to avoid nocturnal torpor. Expand
Powers
Measurements of metabolic rate and fat deposition were made on a three-species hummingbird guild in southeastern Arizona to determine if the energetic advantage gained by a dominant territorialExpand
When Do Hummingbirds Use Torpor in Nature?
TLDR
Body masses of broad-tailed hummingbirds were used to evaluate the "routine" and "emergency-only" hypothesis of torpor in hummingbirds, and Estimated energy equivalents of daily cycles of storage and depletion did not support the routine hypothesis. Expand
Torpor in three species of Brazilian hummingbirds under semi-natural conditions
TLDR
It is suggested that multiple nocturnal torpors result from interruption of the normal torpor pattern by some (unknown) external stimuli, and there is a body mass threshold below which the hummingbirds must enter torpor. Expand
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. Expand
First observed roost site of the Vervain Hummingbird ( Mellisuga minima )
An observation of a roost site of a male Vervain Hummingbird in the Dominican Republic on 7 November 2010 is the first for this species. The bird chose an entirely exposed position on a very thinExpand
Torpor duration, more than temperature, is key to hummingbird nighttime energy savings
TLDR
It is shown that a small endotherm’s nighttime energy management in its natural habitat is more affected by torpor bout duration, which is linked to photoperiod, than by temperature, which suggests that in their natural environments, hummingbirds are able to save energy in torpor across a range nighttime temperature. Expand
Seasonal Changes in Body Mass and Use of Torpor in a Migratory Hummingbird
TLDR
Both body mass and use of torpor were highest in autumn, suggesting that torpor is not reserved for immediate energy crises at this time, but may be important in maximizing energy savings and thus minimizing the time required for premigratory fattening. Expand
A Study on Daily Torpor in the Korean Striped Field Mouse (Apodemus agrarius)
TLDR
Patterns of induced daily torpor were measured in the striped field mouse, Apodemus agrarius, in response to low temperature, food deprivation and various photoperiods using implanted data loggers, indicating that torpor is an adaptive hypothermia to unpredictable environment in both some males and females. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 12 REFERENCES
Regulation of Oxygen Consumption and Body Temperature during Torpor in a Hummingbird, Eulampis jugularls
The West Indian hummingbird, Eulampis jugularis, maintained its body temperature in torpor at 18� to 20�C over an ambient temperature range of 2.5� to 18�C. At ambient below 18�C oxygen consumptionExpand
Environmental influence of regulated body temperature in torpid hummingbirds.
TLDR
The regulation of body temperature in torpor for Panterpe insignis and Eugenes fulgens, highland tropical humming-birds, is related to minimum environmental temperatures and is not a function of body size. Expand
Hypothermia of Broad-Tailed Hummingbirds during Incubation in Nature with Ecological Correlations
The first continuous recordings of natural hypothermia, and the only evidences of hypothermia during incubation, were obtained from temperature sensors embedded in synthetic hummingbird eggs placedExpand
Temperature Relationships and Nesting of the Calliope Hummingbird
This is a consequence of the inverse relationship of surface/volume ratio to body mass (Mo.67/M1.? = M-0.33) and of thermal conductance to body mass (M-0.5; Herreid and Kessel 1967; Lasiewski et al.Expand
Use of Caves by Hummingbirds and Other Species at High Altitudes in Peru
Most hummingbirds live in the tropics. Those living in cold climates are faced with the problem of supporting their exceedingly high rate of metabolism over long periods of darkness and bad weather.Expand
The relation between the torpor cycle and heat exchange in the California pocket mouse Perognathus californicus.
  • V. Tucker
  • Chemistry, Medicine
  • Journal of cellular physiology
  • 1965
TLDR
The measured time course of body temperature and oxygen consumption during entry into torpor compare favorably with theoretical curves calculated under conditions of minimum heat production and maximum heat loss, and further investigations of the effects of body size on heatproduction and loss are suggested. Expand
Similar to those used for the monkey by
  • J. Neurophysiol
  • 1972
Electroencephalogr
  • Clin. Neurophysiol
  • 1970
...
1
2
...