Article,

Re-examination of the ``3/4-law'' of Metabolism

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Journal of Theoretical Biology, 209 (1): 9--27 (March 2001)
DOI: 10.1006/jtbi.2000.2238

Abstract

We examine the scaling law Bis proportional toMalphawhich connects organismal resting metabolic rate B with organismal mass M, where alpha is commonly held to be 3/4. Since simple dimensional analysis suggests alpha=2/3, we consider this to be a null hypothesis testable by empirical studies. We re-analyse data sets for mammals and birds compiled by Heusner, Bennett and Harvey, Bartels, Hemmingsen, Brody, and Kleiber, and find little evidence for rejecting alpha=2/3 in favor ofalpha =3/4. For mammals, we find a possible breakdown in scaling for larger masses reflected in a systematic increase in alpha. We also review theoretical justifications of alpha=3/4 based on dimensional analysis, nutrient-supply networks, and four-dimensional biology. We find that present theories for alpha=3/4 require assumptions that render them unconvincing for rejecting the null hypothesis that alpha=2/3.

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