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Titolo:
The physiology of hibernation in common map turtles (Graptemys geographica)
Autore:
Reese, SA; Crocker, CE; Carwile, ME; Jackson, DC; Ultsch, GR;
Indirizzi:
Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 t Biol Sci, Tuscaloosa, AL 35487 USA San Francisco State Univ, Dept Biol Sci, San Francisco, CA 94132 USA San Francisco State Univ San Francisco CA USA 94132 ancisco, CA 94132 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:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 2, volume: 130, anno: 2001,
pagine: 331 - 340
SICI:
1095-6433(200109)130:2<331:TPOHIC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRESH-WATER TURTLES; ACID-BASE STATUS; CHRYSEMYS-PICTA-BELLII; STERNOTHERUS-ODORATUS; SIMULATED HIBERNATION; PAINTED TURTLES; GAS-EXCHANGE; ION BALANCE; SUBMERGENCE; NORTHERN;
Keywords:
common map turtles; Graptemys geographica; hibernation; acid-base balance; ionic balance; overwintering;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Ultsch, GR Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 Tuscaloosa, AL 35487 USA
Citazione:
S.A. Reese et al., "The physiology of hibernation in common map turtles (Graptemys geographica)", COMP BIOC A, 130(2), 2001, pp. 331-340

Abstract

Map turtles from Wisconsin were submerged at 3 degreesC in normoxic and anoxic water to simulate extremes of potential respiratory microenvironments while hibernating under ice. In predive turtles, 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 body mass were determined, and plasma [HCO3-] was calculated. Turtles in anoxic water developed a severe metabolic acidosis, accumulating lactate from a predive value of 1.7 to 116 mmol/l at 50 days, associated with a fall in pHfrom 8.010 to 7.128. To buffer lactate increase, total calcium and magnesium rose from 3.5 and 2.0 to 25.7 and 7.6 mmol/l, respectively. Plasma [HCO3-] was titrated from 44.7 to 4.3 mmol/l in turtles in anoxic water. Turtlesin normoxic water had only minor disturbances of their acid-base status and ionic statuses; there was a marked increase in hematocrit from 31.1 to 51.9%. This study and field studies suggest that map turtles have an obligatory requirement for a hibernaculum that provides well-oxygenated water (e.g.rivers and large lakes rather than small ponds and swamps) and that this requirement is a major factor in determining their micro distribution. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 23:49:01