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Titre du Document
The physiology of hibernation among painted turtles : the midland painted turtle (Chrysemys picta marginata)
Auteur(s)
REESE Scott A. ; CROCKER Carlos E. ; JACKSON Donald C. ; ...
Résumé
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 PO2, PCO2, pH, [Cl-], [Na+], [K+], total Mg, total Ca, lactate, glucose, and osmolality were measured; hematocrit and mass were determined, and plasma [HCO3-] 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 [HCO3-] 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.
Editeur
Elsevier; Elsevier
Identifiant
PMID : 11084202 ISSN : 0034-5687 CODEN : RSPYAK
Source
Respiration physiology A. 2000, vol. 124, n° 1, pp. 43-50 [bibl. : 23 ref.]
Langue
Anglais
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