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Fixation probability in spatially changing environments

Published online by Cambridge University Press:  14 April 2009

Hidenori Tachida  and
Masaru Iizuka
Hidenori Tachida*
Affiliation:
National Institute of Genetics, Mishima, Shizuoka-ken 411, Japan
Masaru Iizuka
Affiliation:
General Education Course, Chikushi Jogakuen Junior College, Ishizaka 2-12-1, Dazaifu-shi, Fukuoka-ken 818-01, Japan
*
*Corresponding author.
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The fixation probability of a mutant in a subdivided population with spatially varying environments is investigated using a finite island model. This probability is different from that in a panmictic population if selection is intermediate to strong and migration is weak. An approximation is used to compute the fixation probability when migration among subpopulations is very weak. By numerically solving the two-dimensional partial differential equation for the fixation probability in the two subpopulation case, the approximation was shown to give fairly accurate values. With this approximation, we show in the case of two subpopulations that the fixation probability in subdivided populations is greater than that in panmictic populations mostly. The increase is most pronounced when the mutant is selected for in one subpopulation and is selected against in the other subpopulation. Also it is shown that when there are two types of environments, further subdivision of subpopulations does not cause much change of the fixation probability in the no dominance case unless the product of the selection coefficient and the local population size is less than one. With dominance, the effect of subdivision becomes more complex.

Type
Research Article
Information
Genetics Research , Volume 58 , Issue 3 , December 1991 , pp. 243 - 251
Copyright
Copyright © Cambridge University Press 1991

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