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Nasal respiratory turbinate function in birds.

N R Geist1

  • 1Department of Zoology, Oregon State University, Corvallis, 97331-2914, USA. nick.geist@sonoma.edu

Physiological and Biochemical Zoology : PBZ
|November 14, 2000
PubMed
Summary

Avian respiratory turbinates conserve significant water and heat during breathing. These complex nasal structures are vital for thermoregulation and water balance in birds, regardless of their environment.

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Area of Science:

  • Comparative physiology
  • Avian biology
  • Respiratory system function

Background:

  • Nasal respiratory turbinates are present in most birds and mammals.
  • They function as intermittent countercurrent heat exchangers during breathing.
  • Their role in avian thermoregulation and water balance requires further investigation.

Purpose of the Study:

  • To examine avian respiratory turbinate function in large bird species.
  • To quantify the impact of turbinates on evaporative water loss and oxygen consumption.
  • To compare avian nasal thermoregulation with that of lizards.

Main Methods:

  • Measured evaporative water loss and oxygen consumption in five large bird species.
  • Compared nasopharyngeal breathing (normal) with oropharyngeal breathing (turbinates bypassed).
  • Calculated water and heat loss rates using lung tidal volumes and exhaled air temperatures.

Main Results:

  • Avian respiratory turbinates significantly conserve water and heat.
  • This conservation is consistent across different avian orders and environments.
  • Birds exhibit higher nasal exhaled air temperatures compared to lizards.

Conclusions:

  • Respiratory turbinates are crucial for maintaining water and heat balance in birds.
  • Their adaptive significance is evident across diverse avian species.
  • Lack of similar adaptations in lizards may relate to lower metabolic and ventilation rates.

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