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vol. 169, no. 2 the american naturalist february 2007 Resolving the Paradox of Stasis: Models with Stabilizing
 

Summary: vol. 169, no. 2 the american naturalist february 2007
Resolving the Paradox of Stasis: Models with Stabilizing
Selection Explain Evolutionary Divergence
on All Timescales
Suzanne Estes* and Stevan J. Arnold
Department of Zoology, Oregon State University, Corvallis,
Oregon 97331
Submitted July 21, 2006; Accepted August 22, 2006;
Electronically published January 4, 2007
Online enhancement: zip archive.
abstract: We tested the ability of six quantitative genetic models
to explain the evolution of phenotypic means using an extensive
database compiled by Gingerich. Our approach differs from past
efforts in that we use explicit models of evolutionary process, with
parameters estimated from contemporary populations, to analyze a
large sample of divergence data on many different timescales. We
show that one quantitative genetic model yields a good fit to data
on phenotypic divergence across timescales ranging from a few gen-
erations to 10 million generations. The key feature of this model is
a fitness optimum that moves within fixed limits. Conversely, a model

  

Source: Arnold, Stevan J. - Department of Zoology, Oregon State University

 

Collections: Biology and Medicine; Environmental Sciences and Ecology