Nom du corpus

Corpus Systématique Animale

Titre du document

Ventilatory accommodation of oxygen demand and respiratory water loss in a large bird, the emu ( Dromaius novaehollandiae ), and a re-examination of ventilatory allometry for birds

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Allometry
  • Thermoregulation
  • Ventilation
  • Emu, Dromaius novaehollandiae
  • BMR : basal metabolic rate
  • BTPS : body temperature, ambient pressure, saturated
  • EO 2 : oxygen extraction
  • EWL : evaporative water loss
  • f R : ventilation frequency
  • RH : relative humidity
  • RHL : respiratory heat loss
  • SEM : standard error of the mean
  • SNK : student-Newman-Keuls multiple range test
  • STPD : standard temperature and pressure, dry
  • T a : ambient temperatures(s)
  • T b : body temperature(s)
  • T ex : expired air temperature(s)
  • T rh : chamber excurrent air temperature
  • V J : ventilation
  • V O2 : oxygen consumption
  • V T : tidal volume
  • V/Q : air ventilation to blood perfusion ratio
Nom du fichier dans la ressource
Oiseaux_v2b_02517
Auteur(s)
  • S. K. Maloney 1
  • T. J. Dawson 1
Affiliation(s)
  • 1) School of Biological Science, University of New South Wales, PO Box 1, 2033, Kensington, Australia
Résumé

Ventilation was studied in the emu, a large flightless bird of mass 40kg, within the range of ambient temperatures from-5 to 45°C. Data for the emu and 21 other species were used to calculate allometric relationships for resting ventilatory parameters in birds (breath frequency=13.5 mass-0.314; tidal volume=20.7 mass1.0). At low ambient temperatures the ventilatory system must accommodate the increased metabolic demand for oxygen. In the emu this was achieved by a combination of increased tidal volume and increased oxygen extraction. Data from emus sitting and standing at-5°C, when metabolism is 1.5x and 2.6x basal metabolic rate, respectively, indicate that at least in the emu an increase in oxygen extraction can be stimulated by low temperature independent of oxygen demand. At higher ambient temperatures ventilation was increased to facilitate respiratory water loss. The emu achieved this by increased respiratory frequency. At moderate heat loads (30–35°C) tidal volume fell. This is usually interpreted as a mechanism whereby respiratory water loss can be increased without increasing parabronchial ventilation. At 45°C tidal volume increased; however, past studies have shown that CO2 washout is minimal under these conditions. The mechanism whereby this is possible is discussed.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - physiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Endocrinology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Animal Science and Zoology
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Biochemistry
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Physiology
Catégories WoS
  • 1 - science ; 2 - zoology
  • 1 - science ; 2 - physiology
Identifiant ISTEX
B71E0E6B7B8BA8493F364EC986F4725663A76F81
Revue

Journal of Comparative Physiology B

Année de publication
1994
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.304
Sous-corpus
  • Oiseaux
Type de publication
Journal
ark:/67375/1BB-8K96K8W0-9
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