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Titolo:
Unsteady-state gas exchange and storage in diving marine mammals: the harbor porpoise and gray seal
Autore:
Boutilier, RG; Reed, JZ; Fedak, MA;
Indirizzi:
Univ Cambridge, Dept Zool, Cambridge CB2 3EJ, England Univ Cambridge Cambridge England CB2 3EJ ool, Cambridge CB2 3EJ, England Univ St Andrews, Gatty Marine Lab, Sea Mammal Res Unit, St Andrews KY16 8LB, Fife, Scotland Univ St Andrews St Andrews Fife Scotland KY16 8LB Y16 8LB, Fife, Scotland
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
fascicolo: 2, volume: 281, anno: 2001,
pagine: R490 - R494
SICI:
0363-6119(200108)281:2<R490:UGEASI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOCOENA-PHOCOENA; CARBONIC-ANHYDRASE; WEDDELL SEALS; BEHAVIOR; MUSCLE; BLOOD;
Keywords:
respiratory quotient; respiratory gas exchange ratio; O-2 and CO2 stores;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Boutilier, RG Univ Cambridge, Dept Zool, Downing St, Cambridge CB2 3EJ, England Univ Cambridge Downing St Cambridge England CB2 3EJ England
Citazione:
R.G. Boutilier et al., "Unsteady-state gas exchange and storage in diving marine mammals: the harbor porpoise and gray seal", AM J P-REG, 281(2), 2001, pp. R490-R494

Abstract

Breath-by-breath measurements of end-tidal O-2 and CO2 concentrations in harbor porpoise reveal that the respiratory gas exchange ratio (R-R; CO2 output/O-2 uptake) of the first lung ventilation in a breathing bout after a prolonged breath-hold is always well below the animal's metabolic respiratory quotient (RQ) of 0.85. Thus the longest apneic pauses are always followedby an initial breath having a very low RR (0.6-0.7), which thereafter increases with each subsequent breath to values in excess of 1.2. Although the O-2 stores of the body are fully readjusted after the first three to four breaths following a prolonged apneic pause, a further three to four ventilations are always needed, not to load more O-2 but to eliminate built-up levels of CO2. The slower readjustment of CO2 stores relates to their greater magnitude and to the fact that they must be mobilized from comparatively large and chemically complex HCO3-/CO2 stores that are built up in the blood and tissues during the breath-hold. These data, and similar measurements on gray seals (12), indicate that it is the readjustment of metabolic RQ and not O-2 stores per se that governs the amount of time an animal must spend ventilating at the surface after a dive.

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Documento generato il 11/07/20 alle ore 10:57:31