Literaturdatenbank
Literaturdatenbank |
|
 |
|
Reese, S. A., Crocker, C. E., Carwile, M. E., Jackson, D. C., & Ultsch, G. R. (2001). The physiology of hibernation in common map turtles (graptemys geographica). Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 130, 331–340.
Added by: Admin (14 Aug 2008 22:46:53 UTC) |
| Resource type: Journal Article BibTeX citation key: Reese2001 View all bibliographic details  |
Categories: General Keywords: Emydidae, Graptemys, Graptemys geographica, Physiologie = physiology, Schildkröten = turtles + tortoises Creators: Carwile, Crocker, Jackson, Reese, Ultsch Collection: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
Views: 2/598
Views index: 10% Popularity index: 2.5% |
| Abstract |
|
Graptemys geographica Map turtles from Wisconsin were submerged at 3 degrees C 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 PO2, PCO2) pH, , , , total Mg, total Ca, lactate, glucose, and osmolality were measured; hematocrit and body mass were determined, and plasma 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 pH from 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 was titrated from 44.7 to 4.3 mmol/l in turtles in anoxic water. Turtles in 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 microdistribution.
Added by: Admin |