Respiratory responses to progressive ambient hypoxia in the sturgeon, Acipenser baeri.
Identifieur interne : 000665 ( PubMed/Checkpoint ); précédent : 000664; suivant : 000666Respiratory responses to progressive ambient hypoxia in the sturgeon, Acipenser baeri.
Auteurs : G. Nonnotte [France] ; V. Maxime ; J P Truchot ; Patrick Williot [France] ; C. PeyraudSource :
- Respiration physiology [ 0034-5687 ] ; 1993.
English descriptors
- KwdEn :
- MESH :
- chemical , blood : Carbon Dioxide, Chlorine, Potassium, Sodium.
- physiology : Fishes, Oxygen, Respiration.
- Acid-Base Equilibrium, Animals, Hydrogen-Ion Concentration, Oxygen Consumption.
Abstract
Changes in respiratory and acid-base variables were studied in siberian sturgeon, Acipenser baeri, during progressive deep hypoxia followed by recovery under normoxic conditions. During hypoxia, both ventilatory frequency and amplitude increased and this sturgeon was able to maintain standard oxygen consumption down to a low critical level of ambient PO2 (PWO2 < 40 mmHg). During the posthypoxic period, an O2 debt was repaid by an elevated oxygen consumption (nearly double control value at 1 h), indicating that a shift to anaerobic metabolism had occurred during exposure to severe hypoxia. Gradually increasing ambient hypoxia initially induced a respiratory alkalosis. Below the critical PWO2 level and during normoxic recovery, a sudden flush of lactate into the blood was associated with a typical metabolic acidosis which was almost totally compensated 3.5 h after return to normoxia. Thus, as for most other fish, respiratory responses of the sturgeon to progressive hypoxia reveal a typical O2 regulatory behavior.
PubMed: 8441872
Affiliations:
- France
- Aquitaine, Nouvelle-Aquitaine
- Arcachon, Bordeaux, Cestas
- Cemagref - centre de Bordeaux, Centre national du machinisme agricole, du génie rural, des eaux et des forêts, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture
Links toward previous steps (curation, corpus...)
Links to Exploration step
pubmed:8441872Le document en format XML
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<front><div type="abstract" xml:lang="en">Changes in respiratory and acid-base variables were studied in siberian sturgeon, Acipenser baeri, during progressive deep hypoxia followed by recovery under normoxic conditions. During hypoxia, both ventilatory frequency and amplitude increased and this sturgeon was able to maintain standard oxygen consumption down to a low critical level of ambient PO2 (PWO2 < 40 mmHg). During the posthypoxic period, an O2 debt was repaid by an elevated oxygen consumption (nearly double control value at 1 h), indicating that a shift to anaerobic metabolism had occurred during exposure to severe hypoxia. Gradually increasing ambient hypoxia initially induced a respiratory alkalosis. Below the critical PWO2 level and during normoxic recovery, a sudden flush of lactate into the blood was associated with a typical metabolic acidosis which was almost totally compensated 3.5 h after return to normoxia. Thus, as for most other fish, respiratory responses of the sturgeon to progressive hypoxia reveal a typical O2 regulatory behavior.</div>
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<Abstract><AbstractText>Changes in respiratory and acid-base variables were studied in siberian sturgeon, Acipenser baeri, during progressive deep hypoxia followed by recovery under normoxic conditions. During hypoxia, both ventilatory frequency and amplitude increased and this sturgeon was able to maintain standard oxygen consumption down to a low critical level of ambient PO2 (PWO2 < 40 mmHg). During the posthypoxic period, an O2 debt was repaid by an elevated oxygen consumption (nearly double control value at 1 h), indicating that a shift to anaerobic metabolism had occurred during exposure to severe hypoxia. Gradually increasing ambient hypoxia initially induced a respiratory alkalosis. Below the critical PWO2 level and during normoxic recovery, a sudden flush of lactate into the blood was associated with a typical metabolic acidosis which was almost totally compensated 3.5 h after return to normoxia. Thus, as for most other fish, respiratory responses of the sturgeon to progressive hypoxia reveal a typical O2 regulatory behavior.</AbstractText>
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