. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 P. MORRISON The influence of ambient temperature on body temperature in Pteropus is shown in Figure 6. Exposures of up to 4 hours at 10° had little effect on the body temperature. At an ambient temperature of 40° the body temperature was maintained roughly constant through a 6-hour exposure but the level was elevated to between 40 and 41°. The average value of ° provided a temperature dif- ferential of only ° for the dissipation of body heat. However, this small differ- ential was apparently adequate because of th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 492 P. MORRISON The influence of ambient temperature on body temperature in Pteropus is shown in Figure 6. Exposures of up to 4 hours at 10° had little effect on the body temperature. At an ambient temperature of 40° the body temperature was maintained roughly constant through a 6-hour exposure but the level was elevated to between 40 and 41°. The average value of ° provided a temperature dif- ferential of only ° for the dissipation of body heat. However, this small differ- ential was apparently adequate because of the very large surface available in the wings, and the ceaseless fanning activity during this heat stress (Robinson and Morrison, 1957). During the later period after the bat had settled down pre- sumably with a lower resting metabolic rate, the upper limit of thermal neutrality appears to have been substantially raised. cc. LJ 0. o o OJ O AVERAGES MINIMUMS. 10 20 30 40 FIGURE 8. Oxygen consumption in Pteropus at various ambient temperatures. Minimum and average values from three runs ($100, 105, 114). Bottom pair of curves shows conductance at low temperature; top pair, at room temperature. The metabolic response to cold exposure measured as oxygen consumption is illustrated in Figure 7. The measurements at higher temperatures (28-34°) were extremely regular, reflecting the behavior of the animal which hung quietly. Indeed, for all measurements the averages for each temperature period (12) were only 10% higher than the minimum values, and the maximum values were only 32% higher. Minimum and average values are plotted in Figure 8 against ambient temperature. There is some question as to which of these most accurately describes the minimum conductance at each temperature. The average value may be too high since extra heat (, above maintenance) is dissipated during movement and activity. On the. Please note that these images are extracted from scanned page images that may
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