Cardiorespiratory responses of white sturgeon to environmental hypercapnia
Identifieur interne : 000356 ( PascalFrancis/Corpus ); précédent : 000355; suivant : 000357Cardiorespiratory responses of white sturgeon to environmental hypercapnia
Auteurs : C. E. Crocker ; A. P. Farrell ; A. K. Gamperl ; J. J. Jr CechSource :
- American journal of physiology. Regulatory, integrative and comparative physiology [ 0363-6119 ] ; 2000.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Cardioventilatory variables and blood-gas, acid-base status were measured in cannulated white sturgeon (Acipenser transmontanus) maintained at 19°C during normocapnic and hypercapnic (PwCO2 ∼20 Torr) water conditions and after the injection of adrenergic analogs. Hypercapnia produced significant increases in arterial PCO2, ventilatory frequency, and plasma concentration of cortisol and epinephrine, and it produced significant decreases in arterial pH and plasma concentration of glucose but no change in arterial PO2, hematocrit, and concentration of lactate or norepinephrine. Hypercapnia significantly increased cardiac output (Q) by 22%, mean arterial pressure (MAP) by 8%, and heart rate (HR) by 8%. However, gut blood flow (GBF) remained constant. In normocapnic fish, phenylephrine significantly constricted the splanchnic circulation, whereas isoproterenol significantly increased Q and produced a systemic vasodilation. During hypercapnia, propranolol significantly decreased Q, GBF, MAP, and HR, whereas phentolamine significantly decreased MAP and increased GBF. These changes suggest that cardiovascular function in the white sturgeon is sensitive to both α- and (3-adrenergic modulation. We found microspheres to be unreliable in predicting GBF on the basis of our comparisons with simultaneous direct measurements of GBF. Overall, our results demonstrate that environmental hypercapnia (e.g., as is experienced in high-intensity culture situations) elicits stress responses in white sturgeon that significantly elevate steady-state cardiovascular and ventilatory activity levels.
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Format Inist (serveur)
NO : | PASCAL 00-0512579 INIST |
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ET : | Cardiorespiratory responses of white sturgeon to environmental hypercapnia |
AU : | CROCKER (C. E.); FARRELL (A. P.); GAMPERL (A. K.); CECH (J. J. JR) |
AF : | Department of Wildlife, Fish, and Conservation Biology, University of California/Davis, California 95616-8751/Etats-Unis (1 aut., 4 aut.); Department of Biological Sciences, Simon Fraser University/Burnaby, British Columbia V5A 1S6/Canada (2 aut., 3 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | American journal of physiology. Regulatory, integrative and comparative physiology; ISSN 0363-6119; Coden AJPRDO; Etats-Unis; Da. 2000; Vol. 48; No. 2; R617-R628; Bibl. 42 ref. |
LA : | Anglais |
EA : | Cardioventilatory variables and blood-gas, acid-base status were measured in cannulated white sturgeon (Acipenser transmontanus) maintained at 19°C during normocapnic and hypercapnic (PwCO2 ∼20 Torr) water conditions and after the injection of adrenergic analogs. Hypercapnia produced significant increases in arterial PCO2, ventilatory frequency, and plasma concentration of cortisol and epinephrine, and it produced significant decreases in arterial pH and plasma concentration of glucose but no change in arterial PO2, hematocrit, and concentration of lactate or norepinephrine. Hypercapnia significantly increased cardiac output (Q) by 22%, mean arterial pressure (MAP) by 8%, and heart rate (HR) by 8%. However, gut blood flow (GBF) remained constant. In normocapnic fish, phenylephrine significantly constricted the splanchnic circulation, whereas isoproterenol significantly increased Q and produced a systemic vasodilation. During hypercapnia, propranolol significantly decreased Q, GBF, MAP, and HR, whereas phentolamine significantly decreased MAP and increased GBF. These changes suggest that cardiovascular function in the white sturgeon is sensitive to both α- and (3-adrenergic modulation. We found microspheres to be unreliable in predicting GBF on the basis of our comparisons with simultaneous direct measurements of GBF. Overall, our results demonstrate that environmental hypercapnia (e.g., as is experienced in high-intensity culture situations) elicits stress responses in white sturgeon that significantly elevate steady-state cardiovascular and ventilatory activity levels. |
CC : | 002A25E |
FD : | Rythme cardiaque; Gaz sanguin; Pression artérielle; Equilibre acidobasique; Carbone dioxyde; Hypercapnie; Noradrénaline; Récepteur adrénergique; Contrôle cardiorespiratoire; Contrôle cardiovasculaire; Respiration; Acipenser transmontanus |
FG : | Hémodynamique; Pisces; Vertebrata |
ED : | Heart rate; Blood gas; Arterial pressure; Acid base balance; Carbon dioxide; Hypercapnia; Norepinephrine; Adrenergic receptor; Cardiorespiratory control; Cardiovascular control; Respiration; Acipenser transmontanus |
EG : | Hemodynamics; Pisces; Vertebrata |
SD : | Ritmo cardíaco; Gas sanguíneo; Presión arterial; Equilibrio acido-base; Carbono dióxido; Hipercapnia; Noradrenalina; Receptor adrenérgico; Control cardiorespiratorio; Control cardiovascular; Respiración; Acipenser transmontanus |
LO : | INIST-670E.354000091005050330 |
ID : | 00-0512579 |
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<front><div type="abstract" xml:lang="en">Cardioventilatory variables and blood-gas, acid-base status were measured in cannulated white sturgeon (Acipenser transmontanus) maintained at 19°C during normocapnic and hypercapnic (Pw<sub>CO2</sub>
∼20 Torr) water conditions and after the injection of adrenergic analogs. Hypercapnia produced significant increases in arterial PCO<sub>2</sub>
, ventilatory frequency, and plasma concentration of cortisol and epinephrine, and it produced significant decreases in arterial pH and plasma concentration of glucose but no change in arterial PO<sub>2</sub>
, hematocrit, and concentration of lactate or norepinephrine. Hypercapnia significantly increased cardiac output (Q) by 22%, mean arterial pressure (MAP) by 8%, and heart rate (HR) by 8%. However, gut blood flow (GBF) remained constant. In normocapnic fish, phenylephrine significantly constricted the splanchnic circulation, whereas isoproterenol significantly increased Q and produced a systemic vasodilation. During hypercapnia, propranolol significantly decreased Q, GBF, MAP, and HR, whereas phentolamine significantly decreased MAP and increased GBF. These changes suggest that cardiovascular function in the white sturgeon is sensitive to both α- and (3-adrenergic modulation. We found microspheres to be unreliable in predicting GBF on the basis of our comparisons with simultaneous direct measurements of GBF. Overall, our results demonstrate that environmental hypercapnia (e.g., as is experienced in high-intensity culture situations) elicits stress responses in white sturgeon that significantly elevate steady-state cardiovascular and ventilatory activity levels.</div>
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<server><NO>PASCAL 00-0512579 INIST</NO>
<ET>Cardiorespiratory responses of white sturgeon to environmental hypercapnia</ET>
<AU>CROCKER (C. E.); FARRELL (A. P.); GAMPERL (A. K.); CECH (J. J. JR)</AU>
<AF>Department of Wildlife, Fish, and Conservation Biology, University of California/Davis, California 95616-8751/Etats-Unis (1 aut., 4 aut.); Department of Biological Sciences, Simon Fraser University/Burnaby, British Columbia V5A 1S6/Canada (2 aut., 3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>American journal of physiology. Regulatory, integrative and comparative physiology; ISSN 0363-6119; Coden AJPRDO; Etats-Unis; Da. 2000; Vol. 48; No. 2; R617-R628; Bibl. 42 ref.</SO>
<LA>Anglais</LA>
<EA>Cardioventilatory variables and blood-gas, acid-base status were measured in cannulated white sturgeon (Acipenser transmontanus) maintained at 19°C during normocapnic and hypercapnic (Pw<sub>CO2</sub>
∼20 Torr) water conditions and after the injection of adrenergic analogs. Hypercapnia produced significant increases in arterial PCO<sub>2</sub>
, ventilatory frequency, and plasma concentration of cortisol and epinephrine, and it produced significant decreases in arterial pH and plasma concentration of glucose but no change in arterial PO<sub>2</sub>
, hematocrit, and concentration of lactate or norepinephrine. Hypercapnia significantly increased cardiac output (Q) by 22%, mean arterial pressure (MAP) by 8%, and heart rate (HR) by 8%. However, gut blood flow (GBF) remained constant. In normocapnic fish, phenylephrine significantly constricted the splanchnic circulation, whereas isoproterenol significantly increased Q and produced a systemic vasodilation. During hypercapnia, propranolol significantly decreased Q, GBF, MAP, and HR, whereas phentolamine significantly decreased MAP and increased GBF. These changes suggest that cardiovascular function in the white sturgeon is sensitive to both α- and (3-adrenergic modulation. We found microspheres to be unreliable in predicting GBF on the basis of our comparisons with simultaneous direct measurements of GBF. Overall, our results demonstrate that environmental hypercapnia (e.g., as is experienced in high-intensity culture situations) elicits stress responses in white sturgeon that significantly elevate steady-state cardiovascular and ventilatory activity levels.</EA>
<CC>002A25E</CC>
<FD>Rythme cardiaque; Gaz sanguin; Pression artérielle; Equilibre acidobasique; Carbone dioxyde; Hypercapnie; Noradrénaline; Récepteur adrénergique; Contrôle cardiorespiratoire; Contrôle cardiovasculaire; Respiration; Acipenser transmontanus</FD>
<FG>Hémodynamique; Pisces; Vertebrata</FG>
<ED>Heart rate; Blood gas; Arterial pressure; Acid base balance; Carbon dioxide; Hypercapnia; Norepinephrine; Adrenergic receptor; Cardiorespiratory control; Cardiovascular control; Respiration; Acipenser transmontanus</ED>
<EG>Hemodynamics; Pisces; Vertebrata</EG>
<SD>Ritmo cardíaco; Gas sanguíneo; Presión arterial; Equilibrio acido-base; Carbono dióxido; Hipercapnia; Noradrenalina; Receptor adrenérgico; Control cardiorespiratorio; Control cardiovascular; Respiración; Acipenser transmontanus</SD>
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<ID>00-0512579</ID>
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