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First published online June 16, 2004
Journal of Experimental Biology 207, 2663-2669 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01071

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Developmental allometry of pulmonary structure and function in the altricial Australian pelican Pelecanus conspicillatus

Roger S. Seymour^1,*, Sue Runciman², Russell V. Baudinette¹ and James T. Pearson³

¹ Environmental Biology, University of Adelaide, Adelaide, SA 5005, Australia
² Anatomy and Histology, Flinders University of South Australia, Adelaide, SA 5001, Australia
³ Cardiac Physiology, National Cardiovascular Center, Suita, Osaka, Japan 565-8565

View larger version (15K): [in a new window]   Fig. 1. Allometry of resting (O2rest) and maximum (O2max) rate of oxygen consumption of 12 Australian pelicans during post-hatching growth (filled circles), excluding one adult bird (open circle). Regression equations: O2rest=0.0149M1.01 (r2=0.98); O2max=0.0040M1.28 (r2=0.99). Data from 33 species of adult birds during flight (open triangles) are from Norberg (1996), converting W to ml min–1 assuming 20 J ml–1, and averaging multiple data from the same species; O2max=0.641M0.80 (r2=0.86). Data from nine species of adult birds exposed to cold (filled triangles) are from Hinds et al. (1993); O2max=0.787M0.62 (r2=0.99). Dotted lines are extrapolations.

View larger version (10K): [in a new window]   Fig. 2. Allometry of lung volume (VL) of 13 Australian pelicans during post-hatching growth (filled circles), excluding one adult (open circle). Data from 26 species of adult birds (triangles) are from Maina et al. (1989). Regression equations: pelicans VL=0.018M1.07 (r2=0.99); adult birds VL=0.022M1.02 (r2=0.98).

View larger version (12K): [in a new window]   Fig. 3. Allometry of the surface area of the blood–gas tissue barrier (St) of 12 Australian pelicans during post-hatching growth (filled circles), excluding one adult bird (open circle). Data from 26 species of adult birds (triangles) are from Maina et al. (1989). Regression equations: pelicans St=1.41M1.25 (r2=0.97); adult birds St=60.2M0.86 (r2=0.94).

View larger version (10K): [in a new window]   Fig. 4. Allometry of harmonic mean thickness of the blood-gas tissue barrier (ht) of 12 Australian pelicans during post-hatching growth (filled circles), excluding one adult bird (open circle). Data from 26 species of adult birds (triangles) are from Maina et al. (1989). Regression equations: pelicans ht=0.400M0.02 (r2=0.03); adult birds ht=0.106M0.07 (r2=0.18).

View larger version (11K): [in a new window]   Fig. 5. Allometry of the oxygen diffusing capacity of the blood–gas tissue barrier (DtO2) of 12 Australian pelicans during post-hatching growth (filled circles), excluding one adult bird (open circle). Data from 26 species of adult birds (triangles) are from Maina et al. (1989). Regression equations: pelicans DtO2=0.0087M1.23 (r2=0.95); adult birds DtO2=1.44M0.79 (r2=0.87).