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A computer model of speciation by founder effects

Published online by Cambridge University Press:  14 April 2009

B. Charlesworth  and
D. B. Smith
B. Charlesworth
Affiliation:
School of Biological Sciences, University of Sussex, Brighton BN1 9QG
D. B. Smith
Affiliation:
School of Biological Sciences, University of Sussex, Brighton BN1 9QG
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Summary

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A computer model of a two-locus genetic system with epistatic selection was used to investigate factors influencing the probability of the origin of reproductive isolation, due to a genetic revolution following a founder event (Mayr, 1954; Carson, 1975). Restricted population size can sometimes cause such a system to drift from one equilibrium to another, which can result in loss of fitness to hybrids with the ancestral population. The chance of such an event was found to be low unless the bottleneck in population size associated with the founder event was preceded by many generations of relaxed selection. It is highest when the bottleneck is not prolonged and when the population size during the bottleneck is not too small. It seems to be difficult to achieve a high degree of reproductive isolation in one step by this method, and it is concluded that it is unlikely to be a major cause of rapid speciation, although it could be a contributory factor.

Type
Research Article
Information
Genetics Research , Volume 39 , Issue 3 , June 1982 , pp. 227 - 236
Copyright
Copyright © Cambridge University Press 1982

References

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