. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 196 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 Torpor. Aestivating animals were most readily distinguished from sleeping animals by their respiratory pattern. Torpid animals showed prolonged periods of apnea, while sleeping ani- mals did not. Oxygen consumption during torpor was usually extremely uniform and fell between and ec/gm/hr. There were, however, occasional increases in rate to as much as cc/gm hr. ruder the conditions used for the measurement of oxygen consumption the duration of torpidity
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 196 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 Torpor. Aestivating animals were most readily distinguished from sleeping animals by their respiratory pattern. Torpid animals showed prolonged periods of apnea, while sleeping ani- mals did not. Oxygen consumption during torpor was usually extremely uniform and fell between and ec/gm/hr. There were, however, occasional increases in rate to as much as cc/gm hr. ruder the conditions used for the measurement of oxygen consumption the duration of torpidity was variable, extending from eight hours to several days. Aestivating ground squirrels observed in the laboratory occasionally shifted position or changed posture without arousing. on x i j o o •J r 2 5 HOURS Fig. 1. Oxygen consumption during two entries into torpor, one induced arousal, and normal activity in an adult c5 C. mohavensis, weighing 232 grams. Ambient temperature varied between 21 and °C. During torpidity body temperature varied directly with air temperature and oral and rectal temperatures did not differ significantly from each other. Torpor was observed in animals al body temperatures ranging from to We do not know whether or not these represent the limits of body tempera- lure at which animals of this species can remain torpid. Arousal. When an aestivating Mohave ground squirrel starts lo arouse, its oxygen consumption rises rapidly and may increase 10 to 20-fold in less than 15 minutes (Figs. 1 and 2). The peak of oxygen consumption is usually reached within 20 minutes of. 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
Size: 1923px × 1299px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
