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Area, Continental Drift and Mammalian Diversity

Published online by Cambridge University Press:  25 May 2016

Karl W. Flessa
Karl W. Flessa*
Affiliation:
Department of Earth and Space Sciences, State University of New York at Stony Brook, Stony Brook, New York 11794.
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Abstract

Mammalian generic, familial, and ordinal diversities correlate significantly with continental area. The area effect is similar in form to that shown for true islands: S = kAz, where S is the diversity, A is the area, and k and z are fitted constants. For mammalian genera and continental area, z equals 0.33, for families, z equals 0.23, and for orders, z equals 0.13.

The area effect permits quantitative modeling of extinction due to biotic competition between previously isolated faunas. The Late Cenozoic extinction of North and South American mammalian faunas following the rise of the Panamanian land bridge is overestimated by seven families. The overestimate may result from assumptions of complete biotic interchange and universal competition. The role of plate tectonics in regulating diversity may be extensively modified by regional environmental conditions.

Type
Research Article
Information
Paleobiology , Volume 1 , Issue 2 , Spring 1975 , pp. 189 - 194
Copyright
Copyright © The Paleontological Society 

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