Cardiorespiratory responses of white sturgeon to environmental hypercapnia
Identifieur interne : 001674 ( Main/Merge ); précédent : 001673; suivant : 001675Cardiorespiratory responses of white sturgeon to environmental hypercapnia
Auteurs : C. E. Crocker [États-Unis] ; A. P. Farrell [Canada] ; A. K. Gamperl [Canada] ; J. J. Jr Cech [États-Unis]Source :
- American journal of physiology. Regulatory, integrative and comparative physiology [ 0363-6119 ] ; 2000.
Descripteurs français
- Pascal (Inist)
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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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Farrell</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Biological Sciences, Simon Fraser University</s1><s2>Burnaby, British Columbia V5A 1S6</s2><s3>CAN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Burnaby, British Columbia V5A 1S6</wicri:noRegion></affiliation></author><author><name sortKey="Gamperl, A K" sort="Gamperl, A K" uniqKey="Gamperl A" first="A. K." last="Gamperl">A. K. Gamperl</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Biological Sciences, Simon Fraser University</s1><s2>Burnaby, British Columbia V5A 1S6</s2><s3>CAN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Burnaby, British Columbia V5A 1S6</wicri:noRegion></affiliation></author><author><name sortKey="Cech, J J Jr" sort="Cech, J J Jr" uniqKey="Cech J" first="J. J. Jr" last="Cech">J. J. 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E." last="Crocker">C. E. Crocker</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Wildlife, Fish, and Conservation Biology, University of California</s1><s2>Davis, California 95616-8751</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Davis, California 95616-8751</wicri:noRegion></affiliation></author><author><name sortKey="Farrell, A P" sort="Farrell, A P" uniqKey="Farrell A" first="A. P." last="Farrell">A. P. Farrell</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Biological Sciences, Simon Fraser University</s1><s2>Burnaby, British Columbia V5A 1S6</s2><s3>CAN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Burnaby, British Columbia V5A 1S6</wicri:noRegion></affiliation></author><author><name sortKey="Gamperl, A K" sort="Gamperl, A K" uniqKey="Gamperl A" first="A. K." last="Gamperl">A. K. Gamperl</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Biological Sciences, Simon Fraser University</s1><s2>Burnaby, British Columbia V5A 1S6</s2><s3>CAN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Burnaby, British Columbia V5A 1S6</wicri:noRegion></affiliation></author><author><name sortKey="Cech, J J Jr" sort="Cech, J J Jr" uniqKey="Cech J" first="J. J. Jr" last="Cech">J. J. Jr Cech</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Wildlife, Fish, and Conservation Biology, University of California</s1><s2>Davis, California 95616-8751</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Davis, California 95616-8751</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">American journal of physiology. Regulatory, integrative and comparative physiology</title><title level="j" type="abbreviated">Am. j. physiol., Regul. integr. comp. physiol.</title><idno type="ISSN">0363-6119</idno><imprint><date when="2000">2000</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">American journal of physiology. Regulatory, integrative and comparative physiology</title><title level="j" type="abbreviated">Am. j. physiol., Regul. integr. comp. physiol.</title><idno type="ISSN">0363-6119</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acid base balance</term><term>Acipenser transmontanus</term><term>Adrenergic receptor</term><term>Arterial pressure</term><term>Blood gas</term><term>Carbon dioxide</term><term>Cardiorespiratory control</term><term>Cardiovascular control</term><term>Heart rate</term><term>Hypercapnia</term><term>Norepinephrine</term><term>Respiration</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Rythme cardiaque</term><term>Gaz sanguin</term><term>Pression artérielle</term><term>Equilibre acidobasique</term><term>Carbone dioxyde</term><term>Hypercapnie</term><term>Noradrénaline</term><term>Récepteur adrénergique</term><term>Contrôle cardiorespiratoire</term><term>Contrôle cardiovasculaire</term><term>Respiration</term><term>Acipenser transmontanus</term></keywords></textClass></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Crocker, C E" sort="Crocker, C E" uniqKey="Crocker C" first="C. E." last="Crocker">C. E. Crocker</name></noRegion><name sortKey="Cech, J J Jr" sort="Cech, J J Jr" uniqKey="Cech J" first="J. J. Jr" last="Cech">J. J. Jr Cech</name></country><country name="Canada"><noRegion><name sortKey="Farrell, A P" sort="Farrell, A P" uniqKey="Farrell A" first="A. P." last="Farrell">A. P. Farrell</name></noRegion><name sortKey="Gamperl, A K" sort="Gamperl, A K" uniqKey="Gamperl A" first="A. K." last="Gamperl">A. K. Gamperl</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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