Morphometrics of the avian lung. 4. The structural design of the charadriiform lung

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The lungs of five charadriiform species of bird, two of which are good divers and three predominantly flyers (soarers and gliders) have been analysed by morphometric techniques. Largely the morphometric structural values in the divers significantly exceeded those of the flyers (gulls). The average weight specific surface area of the blood-gas (tissue) barrier in the divers (28.45 ± 2.05 cm2 · g-1SD) surpassed that of the flyers (23.5 ± 3.61 cm2 · g-1SD). The divers had a higher volume of the pulmonary capillary blood per unit body weight (4.42 ± 0.11 cm3· kg-1SD) than the flyers (2.84 ± 0.58 cm3 · kg-1SD. The weight specific volume of the lung in the divers (34.90 ± 3.11 cm3 · kg-1SD) exceeded that of the flyers (26.94 ± 3.15 cm3 · kg-SD). The total morphometric pulmonary diffusing capacity per unit body weight in the divers (4.73 ± 0.05 m O2 · (min · mm Hg · kg)-1SD) was higher than that of the flyers (3.09 ± 0.47 ml O2 · (min · mm Hg · kg)-1SSD). The divers, however, had a notably thicker blood-gas (tissue) barrier with a harmonic mean thickness of 0.212 ± 0.03 μm SD compared to that of the flyers (0.138 ± 0.02 μm SD). The data acquired here commensurate the modes of life exhibited by these two groups of bird. The divers, which are relatively energitic birds, expend a lot of energy to move and stay underwater, concomitantly undergoing prolonged asphyxia during submergence and may hence need to extract as much of the oxygen in the pulmonary air as possible to prolong a dive. These birds appear in general to have structurally better adapted lungs than those of the gulls, birds which to a large extent exhibit relatively less energetic soaring and gliding flights.

Original languageEnglish
Pages (from-to)99-119
Number of pages21
JournalRespiration Physiology
Issue number1
Publication statusPublished - Apr 1987
Externally publishedYes


  • Bird
  • Diffusing capacity
  • Diver
  • Flyer
  • Lung
  • Morphometry
  • Oxygen demand

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine


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