Literaturdatenbank
Literaturdatenbank |
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Hartley, L. M., Packard, M. J., & Packard, G. C. (2000). Accumulation of lactate by supercooled hatchlings of the painted turtle (chrysemys picta): implications for overwinter survival. Journal of Comparative Physiology B. Biochemical, Systems, and Environmental Physiology, 170(1), 45–50.
Added by: Admin (17 Aug 2008 18:17:18 UTC) |
| Resource type: Journal Article BibTeX citation key: Hartley2000 View all bibliographic details  |
Categories: General Keywords: Chrysemys, Chrysemys picta, Emydidae, Physiologie = physiology, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Hartley, Packard, Packard Collection: Journal of Comparative Physiology B. Biochemical, Systems, and Environmental Physiology |
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| Abstract |
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Hatchlings of the North American painted turtle (Chrysemys picta) typically spend their first winter of life inside the shallow, subterranean nest where they completed embryogenesis the preceding summer. Neonates at northern localities consequently may be exposed during winter to subzero temperatures and frozen soil. Hatchlings apparently survive exposure to such conditions by supercooling, but the physiological consequences of this adaptive strategy have not been examined. We measured lactate in hatchling painted turtles after exposure to each of three temperatures (0 degree C, -4 degrees C, and -8 degrees C) for three time periods (5 days, 15 days, and 25 days) to determine the extent to which overwintering hatchlings might rely on anaerobic metabolism to regenerate ATP. Whole-body lactate increased with increasing duration of exposure and decreasing temperature, and the highest levels were associated with the group that experienced the highest mortality. These results indicate that animals may develop a considerable lactic acidosis during a winter in which temperatures fall below 0 degree C for weeks or months and that accumulation of lactate may contribute to mortality of overwintering animals.
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