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GeoJournal

, Volume 18, Issue 2, pp 133–139 | Cite as

How many species?

  • Iberall A. S. 
Article

Abstract

Simpson's query (Evol., 1952) as to the number of species during earth's history is addressed once again. Some possible mechanistic contraints are put on the problem to distinguish the effects on species evolution from punctuate forces (geological selection pressure generated by buoyancy and tectonic processes) and from near continuous point mutation forces (selection pressure put on the gene pool from the local environment). That is, the long time scaling rate for the life process (its appearance and disappearance) perhaps can be accounted for feasibly by rather straightforward geophysical-geochemical processes.

Keywords

Environmental Management Point Mutation Selection Pressure Gene Pool Local Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Iberall A. S. 
    • 1
  1. 1.UCLALos AngelesUSA

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