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SelectionThe Mechanism of Evolution$
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Graham Bell

Print publication date: 2007

Print ISBN-13: 9780198569725

Published to Oxford Scholarship Online: May 2008

DOI: 10.1093/acprof:oso/9780198569725.001.0001

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Speciation

Speciation

Chapter:
(p.462) CHAPTER 13 Speciation
Source:
Selection
Author(s):

Graham Bell

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198569725.003.0013

Diversification occurs readily in asexual populations, but is obstructed by recombination in outcrossed sexual organisms. Species may arise because sexual isolation permits diversification, or because sexual isolation follows diversification; this chapter takes the former view. The first section in this final chapter is called Speciation and diversification and it details allopatric and sympatric divergence; asexual diversification; the poverty of the protists; and speciation in macrobes. The second section is called Experimental speciation and is about sexual divergence by drift; disruptive natural selection; the evolution of isolating mechanisms; divergent natural selection in complete isolation; reinforcement; artificial selection for sexual isolation; sexual divergence; and offers a new species of yeast. The final section entitled Emerging species is all about sticklebacks; whitefish; and sedges.

Keywords:   allopatric, sympatric, ecological speciation, sexual isolation, isolating mechanism reinforcement, stickleback, whitefish, Carex

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