. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAMMALIAN' HIBKRXATIOX 391 I ho same order of magnitude, but unfortunately cannot be exactly compared. Accordingly, in the thirteen-lined ground squirrel there is an adaptation during hibernation to facilitate conduction at lower temperatures than would be possible in the active ground squirrel. 30 o LlJ 2 >- \- o O _J UJ > o 3 o O o 20 10- o 2HR o 9 HR •24HR ? 48-72 HR. CTN-16 1/17/58 48 DAYS TOTAL HIB 5 10 TEMPERATURE IN °C Fig. -. Conduction velocity versus temperaturi merits extentliiig over ;i period o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAMMALIAN' HIBKRXATIOX 391 I ho same order of magnitude, but unfortunately cannot be exactly compared. Accordingly, in the thirteen-lined ground squirrel there is an adaptation during hibernation to facilitate conduction at lower temperatures than would be possible in the active ground squirrel. 30 o LlJ 2 >- \- o O _J UJ > o 3 o O o 20 10- o 2HR o 9 HR •24HR ? 48-72 HR. CTN-16 1/17/58 48 DAYS TOTAL HIB 5 10 TEMPERATURE IN °C Fig. -. Conduction velocity versus temperaturi merits extentliiig over ;i period of 72 hours. 20 ill ;i scries of measure- The average curves for animals that had just entered hiberna- tion (3 days and 12 days) (Fig. 3) show a progressive lowering of the intercept with no change in slope. Consequently, the nerve has maintained the same ability to respond to changes in temperature, and yet has adjusted so as to function at tempera- tures that would otherwise block conduction. As hibernation is extended from 12 to 32 clays or longer, the slope is reduced by about one-half its former value with little change in intercept. In animals sacrificed during the awakening process (Tb=20°C I the nerve maintains unchanged its ability to conduct at low temperatures, but the conduction-velocity increment has in- creased during this brief period (V-2 hour) to a value halfway. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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