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ing, and assessing details of the relationship among megafauna biomass, potentially available NPP, and available solar energy as estimated from climate and vegetation models. It would also be useful to accumulate region-by-region estimates of both human and non-human biomass through time. Despite leaving room for such refinements, this first effort highlights some overall trends that appear robust.


I thank Elizabeth A. Hadly and Pablo Marquet for discussions about these ideas; Claudio Latorre for discussions about extinctions in South America; and Paul Koch, Robert Feranec, and Alan Shabel for help in assembling information. Useful comments on the manuscript were supplied by John Avise, Jenny McGuire, Nick Pyenson, and two anonymous reviewers. This work was done under the auspices of the U.S. Fulbright Senior Specialist Program at the Department of Ecology, Pontificia Universidad Católica, Santiago, Chile. Funding also was contributed by National Science Foundation Grants EAR-0720387 and DEB-0543641.

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