Competitive speciation

Competitive speciation A new mode of speciation, competitive speciation, is suggested. It assumes that fitness is depressed by the density of a phenotype's competitors, and that the adaptive landscape of phenotypes is complex. From this it follows that some intermediate forms may be fit if and only if some extreme forms are rare or absent. Subsequent to the evolution and population growth of both extreme forms, the intermediate may disappear and homogamy evolve among each of the extremes because of disruptive selection If so, sympatric speciation has occurred and niche space has been rendered into discrete segments. The limitations of the forces leading to competitive speciation are explored. Competitive speciation is discussed in relation to stasipatric speciation and host race formation. It may be responsible for both. Finally the rates of geographical speciation and polyploidy are compared to those of competitive speciation. The latter should be almost as fast as polyploidy and may be at the root of adaptive radiation. Unlike either polyploidy or geographical speciation, competitive speciation accelerates when species diversity declines. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Journal of the Linnean Society Oxford University Press

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Publisher
Oxford University Press
Copyright
Copyright © 1978 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0024-4066
eISSN
1095-8312
DOI
10.1111/j.1095-8312.1978.tb00016.x
Publisher site
See Article on Publisher Site

Abstract

A new mode of speciation, competitive speciation, is suggested. It assumes that fitness is depressed by the density of a phenotype's competitors, and that the adaptive landscape of phenotypes is complex. From this it follows that some intermediate forms may be fit if and only if some extreme forms are rare or absent. Subsequent to the evolution and population growth of both extreme forms, the intermediate may disappear and homogamy evolve among each of the extremes because of disruptive selection If so, sympatric speciation has occurred and niche space has been rendered into discrete segments. The limitations of the forces leading to competitive speciation are explored. Competitive speciation is discussed in relation to stasipatric speciation and host race formation. It may be responsible for both. Finally the rates of geographical speciation and polyploidy are compared to those of competitive speciation. The latter should be almost as fast as polyploidy and may be at the root of adaptive radiation. Unlike either polyploidy or geographical speciation, competitive speciation accelerates when species diversity declines.

Journal

Biological Journal of the Linnean SocietyOxford University Press

Published: Sep 1, 1978

References

  • Modes of animal speciation.
    BUSH, BUSH
  • Disruptive selection on I‐maze activity in
    COYNE, COYNE; GRANT, GRANT
  • The genetics of host selection and its bearing on sympatric speciation in Procecidochares (Diptera: Tephritidae).
    HUETTEL, HUETTEL; BUSH, BUSH
  • Gene flow and selection in a cline.
    SLATKIN, SLATKIN
  • Models of speciation.
    WHITE, WHITE

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