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Titolo:
The physiology of hibernation among painted turtles: the midland painted turtle (Chrysemys picta marginata)
Autore:
Reese, SA; Crocker, CE; Jackson, DC; Ultsch, GR;
Indirizzi:
Univ Alabama, Dept Sci Biol, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 t Sci Biol, Tuscaloosa, AL 35487 USA Brown Univ, Dept Mol Pharmacol Physiol & Biotechnol, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 & Biotechnol, Providence, RI 02912 USA
Titolo Testata:
RESPIRATION PHYSIOLOGY
fascicolo: 1, volume: 124, anno: 2000,
pagine: 43 - 50
SICI:
0034-5687(200012)124:1<43:TPOHAP>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACID-BASE STATUS; FRESH-WATER TURTLES; SIMULATED HIBERNATION; ION BALANCE; 3-DEGREES-C; NORTHERN;
Keywords:
acid-base, metabolic acidosis; buffer, blood; diving, normoxia, hypoxia; anoxia, diving turtles; reptiles, turtles;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Ultsch, GR Univ Alabama, Dept Sci Biol, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 Tuscaloosa, AL 35487 USA
Citazione:
S.A. Reese et al., "The physiology of hibernation among painted turtles: the midland painted turtle (Chrysemys picta marginata)", RESP PHYSL, 124(1), 2000, pp. 43-50

Abstract

Midland painted turtles from Michigan were submerged at 3 degreesC 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 3.7and 2.6 to 58.9 and 11.8 mmol/L, respectively. Plasma [HCO3-] was titratedfrom 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. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 08/07/20 alle ore 05:41:21