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Evolution's WedgeCompetition and the Origins of Diversity$
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David W. Pfennig and Karin S. Pfennig

Print publication date: 2012

Print ISBN-13: 9780520274181

Published to California Scholarship Online: May 2013

DOI: 10.1525/california/9780520274181.001.0001

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(p.178) (p.179) 8 Speciation
Evolution's Wedge

David W. Pfennig

Karin S. Pfennig

University of California Press

New species form during an extended process, which often begins when populations become physically separated and ends when they come into secondary contact and possess or subsequently evolve barriers to gene exchange. Selection can play an important role in promoting population divergence and reproductive isolation. Character displacement, in particular, potentially plays a key role in speciation by finalizing boundaries between incipient species that diverged in allopatry, by initiating divergence between populations in sympatry and allopatry with heterospecifics, and by initiating and finalizing differentiation of alternative morphs. Although character displacement's contribution to diversification has traditionally focused on its role in maintaining and enhancing differences between existing species, it might play an equally crucial role in generating new species.

Keywords:   alternative morphs, population divergence, reproductive isolation, speciation, sympatric speciation

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