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Science 9 November 1979:
Vol. 206. no. 4419, pp. 649 - 654
DOI: 10.1126/science.493968
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Articles

Science, Vol 206, Issue 4419, 649-654
Copyright © 1979 by American Association for the Advancement of Science

articles

Endothermy and activity in vertebrates

AF Bennett and JA Ruben

Resting and maximal levels of oxygen consumption of endothermic vertebrates exceed those of ectotherms by an average of five- to tenfold. Endotherms have a much broader range of activity that can be sustained by this augmented aerobic metabolism. Ectotherms are more reliant upon, and limited by, anaerobic metabolism during activity. A principal factor in the evolution of endothermy was the increase in aerobic capacities to support sustained activity.


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