Lung volumes in giraffes, Giraffa camelopardalis

Show simple item record Mitchell, Graham Skinner, J.D. (John Dawson), 1932- 2011-05-04T10:41:47Z 2011-05-04T10:41:47Z 2011-01
dc.description.abstract We have measured lung mass and trachea dimensions in 46 giraffes of both genders ranging in body mass from 147 kg to 1441 kg, calculated static and dynamic lung volumes, and developed allometric equations that relate changes in them to growth. We found that relative lung mass is 0.6±0.2% of body mass which is significantly less than it is in other mammals (1.1±0.1%). Total lung volume is significantly smaller (46.2± 5.9 mL kg−1) than in similar sized mammals (75.0±2.1 mL kg−1). The lung volume:body mass ratio decreases during growth rather than increase as it does in other mammals. Tracheal diameter is significantly narrower than in similar sized mammals but dead space volume (2.9±0.5 mL kg−1) is larger than in similar sized mammals (2.4±0.1 mL kg−1). Our calculations suggest that tidal volume (10.5±0.2 mL kg−1) is increased compared to that in other mammals(10.0±0.2 mL kg−1) so that the dead space:tidal volume ratio is the same as in other mammals. Calculated Functional Residual Capacity is smaller than predicted (53.4±3.5 vs 33.7±0.6 mL kg−1) as is Expiratory Reserve Volume (47.4±2.6 vs 27.2±1.0 mL kg−1, but Residual Volume (6.0±0.4 mL kg−1) is the same as in other similar sized mammals (6.0±0.9 mL kg−1. Our calculations suggest that Inspiratory Reserve Volume is significantly reduced in size (11.6±1.6 vs 3.8± 2.4 mL kg−1), and, if so, the capacity to increase tidal volume is limited. Calculated dynamic lung volumes were the same as in similar sized mammals. We have concluded that giraffe morphology has resulted in lung volumes that are significantly different to that of similar sized mammals, but these changes do not compromise ventilatory capacity. en
dc.description.sponsorship We thank the management and staff of the Bubye Valley Conservancy, Zimbabwe for their logistical support and sponsorship of this study. Additional funds were provided by the Don Craib Trust (JDS), from a personal research grant (JDS) and the University of Wyoming (GM). en
dc.identifier.citation Mitchell, G & Skinner, JD 2011, 'Lung volumes in giraffes, Giraffa camelopardalis', Comparative Biochemistry and Physiology, Part A, vol. 158, no. 1, pp. 72-78. [] en
dc.identifier.issn 1095-6433
dc.identifier.issn 1531-4332 (online)
dc.identifier.other 10.1016/j.cbpa.2010.09.003
dc.language.iso en en
dc.publisher Elsevier en
dc.rights © 2010 Elsevier Inc. All rights reserved. en
dc.subject Giraffe (Giraffa camelopardalis) en
dc.subject Static lung volumes en
dc.subject Dynamic lung volumes en
dc.subject.lcsh Giraffe -- Anatomy en
dc.title Lung volumes in giraffes, Giraffa camelopardalis en
dc.type Postprint Article en

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