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Evolution and the Levels of Selection$
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Samir Okasha

Print publication date: 2006

Print ISBN-13: 9780199267972

Published to Oxford Scholarship Online: January 2007

DOI: 10.1093/acprof:oso/9780199267972.001.0001

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Species Selection, Clade Selection, and Macroevolution

Species Selection, Clade Selection, and Macroevolution

(p.203) 7 Species Selection, Clade Selection, and Macroevolution
Evolution and the Levels of Selection

Samir Okasha (Contributor Webpage)

Oxford University Press

This chapter examines selection at the level of species and clades. The history of the species selection debate, including its conceptual link to the idea that species are individuals, is outlined. The issue of how to distinguish ‘real’ species selection from ‘species sorting’ (i.e., differential speciation/extinction that is a side effect of causal processes at other levels) is analyzed. It is argued that clade-level selection is conceptually problematic given that clades, being monophyletic by definition, cannot form parent-offspring lineages.

Keywords:   species selection, species sorting, individuality thesis, macroevolution, avatar selection, clade selection, monophyly

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