. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. IS BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 The special functioning" of the nervous system in hibernation is shown if we study the respiratory frequency versus the oxygen consumption in six-hour experiments on hibernating marmots (Kayser, 1940a) (Fig. 4), or the heart frequency versus the respiratory frequency in hibernating European ground squirrels ( Kayser, 1957b) I Fig. 5). movementsAnin. 5 r 0> o >^ 1_ o o Q. QJ cr U - 3 - 2 - 1 - N«8 b = r= 01 234 56789 beats/min. Heart rate Fig.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. IS BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 The special functioning" of the nervous system in hibernation is shown if we study the respiratory frequency versus the oxygen consumption in six-hour experiments on hibernating marmots (Kayser, 1940a) (Fig. 4), or the heart frequency versus the respiratory frequency in hibernating European ground squirrels ( Kayser, 1957b) I Fig. 5). movementsAnin. 5 r 0> o >^ 1_ o o Q. QJ cr U - 3 - 2 - 1 - N«8 b = r= 01 234 56789 beats/min. Heart rate Fig. .">. Heart frequency versus respiratory frequency in hibernating European ground squirrels (Kayser, 1957b). Figure 4 shows that there is no correlation between respiratory frequency and oxygen consumption, and Figure .1 shows that there is a negative correlation between heart frequency and respiratory frequency in deep hibernation. Both functions, res- piratory and cardiac, remain under the influence of the nervous system but there is no longer integration of these two functions in respect to the energetic needs in hibernation. Third Point Despite these enormous differences winch contrast a hibernat- ing hibernator to itself in the active state in summer, and which. 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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