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Phys Rev Lett. 2009 Jan 23;102(3):038103. Epub 2009 Jan 22.

Evolutionary model of species body mass diversification.

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1
Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, New Mexico 87501, USA. aaronc@santafe.edu

Abstract

We present a quantitative model for the biological evolution of species body masses within large groups of related species, e.g., terrestrial mammals, in which body mass M evolves according to branching (speciation), multiplicative diffusion, and an extinction probability that increases logarithmically with mass. We describe this evolution in terms of a convection-diffusion-reaction equation for lnM. The steady-state behavior is in good agreement with empirical data on recent terrestrial mammals, and the time-dependent behavior also agrees with data on extinct mammal species between 95-50 Myr ago.

PMID:
19257399
DOI:
10.1103/PhysRevLett.102.038103
[Indexed for MEDLINE]
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