The Role of Hyperthermia in the Water Economy of Desert Birds

@article{Tieleman1999TheRO,
  title={The Role of Hyperthermia in the Water Economy of Desert Birds},
  author={B. Irene Tieleman and Joseph B. Williams},
  journal={Physiological and Biochemical Zoology},
  year={1999},
  volume={72},
  pages={87 - 100}
}
A number of authors have suggested that hyperthermia, the elevation of body temperature (Tb) 2°–4°C above normal, contributes to a reduction in total evaporative water loss (TEWL) in birds. Information about the role of hyperthermia in the water economy of birds is scattered throughout the literature. We purposed to collate the available information on this subject, to reevaluate the benefits and costs of this process, and to assess its net effect on the water economy of birds, especially… 

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References

SHOWING 1-10 OF 63 REFERENCES

Physiological Thermoregulation in Heat-Stressed Birds: Consequences of Body Size

  • W. Weathers
  • Environmental Science
    Physiological Zoology
  • 1981
Calculations of rates of heat exchange show that hyperthermia contributes little to the cost of avian temperature regulation in hot environments, while it significantly enhances water conservation in small birds.

Thermoregulatory Responses to Heat Stress in Four Species of Birds Weighing Approximately 40 Grams

This study examines and compares thermoregulatory responses of four diverse species of birds to controlled conditions of humidity and temperature and concludes that most birds exposed to heat stress become hyperthermic and may minimize metabolic heat production by reducing their activity.

BODY TEMPERATURE, OXYGEN CONSUMPTION, EVAPORATIVE WATER LOSS, ANDI HEART RATE IN THE POOR-WILL

Both captive, adult PIoor-wills were maintained for many months in captivity and were fed on a diet of meal worms (Tenebrio larvae) and canned cat food.

Heat regulation in some arctic and tropical mammals and birds.

A series of arctic and tropical mammals and birds at Point Barrow, Alaska (lat. 71° N.) and in Panama (lat. 9° N.) was subjected to various air temperatures in a respiration chamber where the heat

Energetics and thermoregulation by small passerines of the humid, lowland tropics

Birds of the open, humid lowland tropics encounter challenging thermal con- ditions-high temperatures, high humidity, and intense solar radiation. I examined how one such species, the Variable

Evaporative losses of water by birds.

  • W. Dawson
  • Environmental Science
    Comparative biochemistry and physiology. A, Comparative physiology
  • 1982
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