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Running on rocket fuel
Date:10/20/2008

prey, wild dogs need to be lithe and athletic, a design that ensures their stomachs can't be too big, which in turn limits the amount they can gorge in a sitting: a physical limitation on their gluttony which biologist call "a morphological constraint." In the same way that Size Zero women can struggle to have children, and bouncing babies, this study highlighted an Achilles heel where energetic poverty translated into reproductive poverty, and a vicious circle whereby small packs have fewer pups, leading to even smaller packs, and driving them into an extinctive vortex.

From a conservation standpoint, these results demonstrate how evolutionary strength gained by sociality can be undermined by an Achilles heel that can push species into extinction. Professor David Macdonald, Director of the Wildlife Conservation Research Unit, known as the WildCRU, which specializes in the science to underpin practical solution to conservation problems, said "This study, unique in its detail, shows the power of energetic theory to enable us to not only understand the evolution of packing power, and facets that dictate the survival of this stunningly beautiful species, but better understand how to conserve other social species of which we are one."


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Contact: Patricia Morse
pmorse@uchicago.edu
773-702-0446
University of Chicago Press Journals
Source:Eurekalert

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