Document Detail


Effects of experimental anemia on blood ion and acid-base status of turtles during submergence in aerated water at 3 degrees C.
MedLine Citation:
PMID:  12890549     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The importance of blood hemoglobin to aquatic oxygen uptake by turtles (Chrysemys picta bellii) submerged in aerated water at 3 degrees C was tested by comparing the responses of anemic turtles (hematocrit approximately 6%) to turtles with normal hematocrits (hematocrit approximately 33%). All turtles were submerged for 42 days and blood samples were collected at 0, 7, 21, 32 and 42 days. Blood was analyzed for pH, PCO(2), PO(2), hematocrit, hemoglobin concentration ([Hb]) and plasma was analyzed for concentrations of lactate, glucose, Na(+), K(+), Ca(2+) and Mg(2+). Plasma [HCO(3)(-)] was calculated. [Hb] correlated closely with hematocrit levels. [Lactate] reached higher final values in anemic turtles (34.5+/-5.3 mmol l(-1)) than in normal turtles (14.5+/-4.6 mmol l(-1)) indicating a greater reliance of the anemic animals on anaerobic metabolism. Both groups compensated for acidosis by reduced PCO(2) and anemic turtles also had increased [Ca(2+)] and [Mg(2+)]. Blood pH fell significantly in the anemic turtles but not in the controls. Although the data indicate that the anemic turtles relied more on anaerobic metabolism than the controls, the effect was much less than expected on the basis of the reduced blood O(2) carrying capacity. Possible compensatory mechanisms utilized by the anemic turtles to minimize anaerobic metabolism are discussed.
Authors:
Donald C Jackson; Sarah F Denniston
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  135     ISSN:  1095-6433     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-07-31     Completed Date:  2004-03-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  597-603     Citation Subset:  IM    
Affiliation:
Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Box G, Providence, RI 02912, USA. donald_jackson@brown.edu
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MeSH Terms
Descriptor/Qualifier:
Acid-Base Equilibrium*
Air
Anemia / blood,  metabolism*,  physiopathology
Animals
Blood Glucose / analysis
Blood Pressure
Calcium / blood
Carbon Dioxide / blood
Cold Temperature*
Hematocrit
Hibernation / physiology
Immersion*
Ions / blood*
Lactic Acid / blood
Magnesium / blood
Partial Pressure
Plasma
Turtles
Water*
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Ions; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid; 7439-95-4/Magnesium; 7440-70-2/Calcium; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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