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Titolo:
Physiology of common map turtles (Graptemys geographica) hibernating in the Lamoille River, Vermont
Autore:
Crocker, CE; Graham, TE; Ultsch, GR; Jackson, DC;
Indirizzi:
Brown Univ, Dept Mol Pharmacol Physiol & Biotechnol, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 & Biotechnol, Providence, RI 02912 USA Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA Univ Alabama Tuscaloosa AL USA 35487 t Biol Sci, Tuscaloosa, AL 35487 USA Worcester State Coll, Dept Biol, Worcester, MA 01602 USA Worcester State Coll Worcester MA USA 01602 Biol, Worcester, MA 01602 USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL ZOOLOGY
fascicolo: 2, volume: 286, anno: 2000,
pagine: 143 - 148
SICI:
0022-104X(20000201)286:2<143:POCMT(>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHRYSEMYS-PICTA-BELLII; ACID-BASE STATUS; SIMULATED HIBERNATION; ION BALANCE; WATER; SUBMERGENCE; 3-DEGREES-C; RESPONSES; NORTHERN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Crocker, CE Brown Univ, Dept Mol Pharmacol Physiol & Biotechnol, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 , Providence, RI 02912 USA
Citazione:
C.E. Crocker et al., "Physiology of common map turtles (Graptemys geographica) hibernating in the Lamoille River, Vermont", J EXP ZOOL, 286(2), 2000, pp. 143-148

Abstract

Common map turtles (Graptemys geographica) were collected from a natural underwater hibernaculum in Vermont at monthly intervals during the winter of1997-1998. Blood was sampled by cardiac puncture and analyzed for pH, PCO2, PO2, and hematocrit; separated plasma was tested for Na+, K+, Cl-, total [Ca], total [Mg], [lactate], and osmolality (mOsm kg(-1) H2O). Control (eupneic; 1 degrees C) values for pH, PO2, PCO2, [HCO3-], and [lactate] were 7.98 +/- 0.03, 47.4 +/- 18.7, 10.1 +/- 0.7 (mm Hg), 36.1 +/-. 0.2 (mmol liter-l), and 2.1 +/- 0.1 (mmol liter(-1)), respectively. Between November 1997 and March 1998, ice covered the river and the turtles rested on the substratum, fully exposed to the water, and were apneic. Blood PO2 was maintained at less than 3 mm Hg (range 0.9 +/- 0.2 to 2.1 +/- 0.7 mm Hg), PCO2 decreased slightly, plasma [lactate] was 15 mmol liter-l, and plasma [HCO3-] decreased significantly. In March [lactate] rose to 7.5 +/- 1.5 mmol liter(-1), but there was no acidemia. Map turtles meet, most of their metabolic demandfor Oz via aquatic respiration and tolerate prolonged submergence at 1 degrees C with little change in acid-base or ionic status. The adaptive significance of remaining essentially aerobic during winter is to avoid the life-threatening progressive acidosis that results from anaerobic metabolism. (C) 2000 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 20:49:57