Respiratory Responses of the Mallard to External and Internal Cooling
In some species of birds, simultaneous measurements of ventilation and oxygen consumption have shown that oxygen extraction increases with the increase in metabolic rate induced by cold exposure (Bucher, 1981; Brent et al., 1983, 1984; Bech et al., 1984). In addition, measurements of the oxygen content in the interclavicular air sac of Pekin ducks, indicate that oxygen extraction improves at low ambient temperatures (Bech et al., 1984). A more efficient gas exchange under cold conditions has an obvious thermoregulatory significance, because a decreased air convection requirement implies a reduction in the respiratory heat and water losses.
KeywordsCold Exposure Oxygen Extraction External Cool Metabolic Heat Production Internal Cool
Unable to display preview. Download preview PDF.
- Brent, R., Pedersen, P. F., Bech, C., and Johansen, K., 1984, Lung ventilation and temperature regulation in the European coot Fulica atra, Physiol. Zool., 57: 19.Google Scholar
- Mercer, J. B., 1985, Use of an oesophageal thermode for the determination of total body thermosensitivity in conscious Eider ducks (Somateria molissima), Acta Physiol. Scand., 124: S542.Google Scholar