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Diversity-dependent species dynamics: incorporating the effects of population-level processes on species dynamics

Published online by Cambridge University Press:  08 April 2016

Brian A. Maurer
Brian A. Maurer*
Affiliation:
Department of Zoology, Brigham Young University, Provo, Utah 84602
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Abstract

A general model of species dynamics must incorporate the effects of species number on the processes of speciation and extinction. Previous models make specific assumptions about these effects, but do not consider the effects of dynamics of lower level entities on speciation and extinction rates. A hierarchical model is developed which explicitly describes the effects of energy use by species on speciation and extinction rates. The effects of energy use are represented by parameters that characterize the average effects of energy use by each species in the biota on speciation and extinction rates. The dynamics of the model describe a sigmoidal increase in species number over time, as does the logistic model of species dynamics. However, the mechanisms of those dynamics are assumed to be different in the two models. Empirical analysis of a data set on the diversification of fossil Miocene horses suggests that the logistic and hierarchical models have similar descriptive power. The hierarchical model incorporates insights from recent considerations of the nature of a hierarchical theory of biology. Further progress in developing such a theory will depend on the success with which relationships among levels in the biological hierarchy are able to be defined.

Type
Articles
Information
Paleobiology , Volume 15 , Issue 2 , Spring 1989 , pp. 133 - 146
Copyright
Copyright © The Paleontological Society 

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