Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis

Brauner, C. J., Baker, D., Hanson, L., Kuchel, L., Jackson, D., Farrell, A. P. and Val, V. L. (2007). Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis. In: Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology: Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, August 12–16, 2007. Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, (S40-S40). August 12–16, 2007. doi:10.1016/j.cbpa.2007.06.102


Author Brauner, C. J.
Baker, D.
Hanson, L.
Kuchel, L.
Jackson, D.
Farrell, A. P.
Val, V. L.
Title of paper Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis
Conference name Seventh International Congress of Comparative Physiology and Biochemistry
Conference location Salvador, Bahia, Brazil
Conference dates August 12–16, 2007
Proceedings title Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology: Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, August 12–16, 2007   Check publisher's open access policy
Journal name Comparative Biochemistry and Physiology A-Molecular   Check publisher's open access policy
Place of Publication New York
Publisher Elsevier
Publication Year 2007
DOI 10.1016/j.cbpa.2007.06.102
ISSN 1095-6433
Volume 148
Issue Supplement 1
Start page S40
End page S40
Total pages 1
Language eng
Abstract/Summary During exposure to elevated water CO2 levels (hypercapnia), blood pH and tissue intracellular pH (pHi) in fish are initially reduced due to the rapid development of a respiratory acidosis. Blood pH recovery is associated with acid–base relevant ion transfer at the gills (i.e., Na+/H+ or Cl−/HCO3−), and generally occurs over 24–48 h during which time pHi recovery closely follows pH recovery of the blood. In the armoured catfish, Liposarcus pardalis, hypercapnia induces a large respiratory acidosis, but intracellular pH (pHi) of tissues such as the liver, heart and muscle is tightly regulated despite large reductions in plasma pH. Using an in situ perfused heart preparation, maximum cardiac performance (power output, cardiac output and stroke volume) was maintained at levels of up to 5% CO2 in L. pardalis. Maintenance of heart function under these conditions was associated with preferential pHi regulation. Following exhaustive exercise and 2 h of anoxia, there was little evidence for lactate incorporation into the skull or bony plates, but liver, heart and brain pHi were preferentially regulated despite a large uncompensated plasma acidosis, indicating that the type of acidosis does not alter the pattern of acid–base regulation in this species. This pattern of preferential pHi regulation differs markedly from that of most fish investigated to date; however, it has also been observed in two other facultative air-breathing fishes, Synbranchus marmoratus and Amia calva, and may be associated with the evolution of air-breathing.
Subjects 0606 Physiology
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Publication History: Formerly known as Comparative Biochemistry and Physiology Part A: Physiology

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Google Scholar Search Google Scholar
Access Statistics: 250 Abstract Views  -  Detailed Statistics
Created: Wed, 25 Feb 2009, 12:58:22 EST by Ms Julie Schofield on behalf of Faculty of Science