Titre du document / Document title
The physiology of hibernation among painted turtles : the midland painted turtle (Chrysemys picta marginata)
Auteur(s) / Author(s)
REESE Scott A. (1) ;
CROCKER Carlos E. (1) ;
JACKSON Donald C. (2) ;
ULTSCH Gordon R. (1 2) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Department of Biological Sciences, University of Alabama, Tuscaloosa, AL 35487-0344, ETATS-UNIS
(2) Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, ETATS-UNIS
Résumé / Abstract
Midland painted turtles from Michigan were submerged at 3°C in normoxic and anoxic water. In predive, and in turtles submerged for up to 150 days, plasma PO
2, PCO
2, pH, [Cl-], [Na
+], [K
+], total Mg, total Ca, lactate, glucose, and osmolality were measured; hematocrit and mass were determined, and plasma [HCO
3-] was calculated. Anoxic turtles developed a severe metabolic acidosis, accumulating lactate from a predive value of 4.4 mmol/L to a 150-day value of 185 mmol/L, associated with a fall in pH from 7.983 to 7.189. To buffer lactate increase, total calcium and magnesium rose from 3.7 and 2.6 to 58.9 and 11.8 mmol/L, respectively. Plasma [HCO
3-] was titrated from 39.2 to 4.8 mmol/L in anoxic turtles. Turtles in normoxic water had only minor disturbances of their acid-base and ionic statuses, associated with a much smaller increase of lactate to 23 mmol/L; there was a marked increase in hematocrit from 29.1% to 42.1%. We suggest that it is ecologic, rather than phylogenetic, relationships that determine the responses of painted turtles to prolonged submergence associated with hibernation.
Revue / Journal Title
Respiration physiology
ISSN
0034-5687
CODEN RSPYAK
Source / Source
2000, vol. 124, n
o1, pp. 43-50 (23 ref.)
Langue / Language
Anglais
Editeur / Publisher
Elsevier, Amsterdam, PAYS-BAS
(1966-2001)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 12641, 35400009325680.0050
Nº notice refdoc (ud4) : 810643
