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Titolo:
Effects of ambient PO2 and temperature on oxygen uptake in Nautilus pompilius
Autore:
Staples, JF; Hershkowitz, JJ; Boutilier, RG;
Indirizzi:
Dept Zool, Cambridge CB2 3EJ, England Dept Zool Cambridge England CB2 3EJ ept Zool, Cambridge CB2 3EJ, England
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
fascicolo: 3, volume: 170, anno: 2000,
pagine: 231 - 236
SICI:
0174-1578(200005)170:3<231:EOAPAT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MYTILUS-EDULIS-L; CONSUMPTION; VENTILATION; CRUSTACEANS; SUPPRESSION; METABOLISM; VULGARIS; TENSION; HYPOXIA; DEPTH;
Keywords:
Nautilus; oxygen consumption; temperature; hypoxia; oxyconformation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Staples, JF Univ Western Ontario, Dept Zool, London, ON N6A 5B7, Canada Univ Western Ontario London ON Canada N6A 5B7 N6A 5B7, Canada
Citazione:
J.F. Staples et al., "Effects of ambient PO2 and temperature on oxygen uptake in Nautilus pompilius", J COMP PH B, 170(3), 2000, pp. 231-236

Abstract

This study employs closed-circuit respirometry to evaluate the effect of declining ambient oxygen partial pressure (PO2) and temperature on mass specific rates of oxygen uptake ((V) over dot O-2) in Nautilus pompilius. At all temperatures investigated (11, 16, and 21 degrees C), (V) over dot O-2 isrelatively constant at high PO2 (oxyregulation) but declines sharply at low PO2 (oxyconformation). The critical PO2 below which oxyconformation begins (P-c) is temperature dependent, higher at 21 degrees C (49 mmHg) than at 11 degrees C or 16 degrees C (21.7 mmHg and 30.8 mmHg respectively). In resting, post-absorptive animals, steady-state resting (V) over dot O-2 increases significantly with temperature resulting in a Q(10) value of approximately 2.5. The metabolic strategy of N. pompilius appears well suited to its lifestyle, providing sufficient metabolic scope for its extensive daily vertical migrations, but allowing for metabolic suppression when PO2 falls toolow. The combination of low temperatures and low PO2 may suppress metabolic rate 16-fold (assuming negligible contributions from anaerobic metabolismand internal O-2 stores), enhancing hypoxia tolerance.

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Documento generato il 09/08/20 alle ore 06:15:38