Equilibrium theory and paleoecology

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Abstract
Recent attempts of paleontologists to apply MacArthur and Wilson''s equilibrium theory to the fossil [fauna] record have been generally unsuccessful. The major difficulties have involved the use of questionable methodologies and the application of a fundamentally inappropriate theoretical base. In the 1st category it appears as if previous methods of data collection and their subsequent analyses must be critically reviewed in order to adequately test the equilibrium theory. Detailed species lists that include population numbers must be compiled for spatially restricted habitats. Sampling of local stratigraphic sections must be carried out on a centimeter by centimeter basis rather than at meter intervals. The use of colonization curves coupled with a determination of species saturation levels apparently will provide a rigorous, quantitative technique for the analysis of equilibrium states. Paleoecologists need to be more critical in their application of ecological theories to the fossil record and in substantiation of this claim, and contrary to earlier reports, it seems as if a valid test of the equilibrium theory in the fossil record has yet to be made.