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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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(p.462) CHAPTER 13 Speciation

Graham Bell

Oxford University Press

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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