### Abstract

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.

Original language | English |
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Pages (from-to) | 243-251 |

Number of pages | 9 |

Journal | Genetical Research |

Volume | 58 |

Issue number | 3 |

DOIs | |

Publication status | Published - Jan 1 1991 |

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### All Science Journal Classification (ASJC) codes

- Genetics

### Cite this

*Genetical Research*,

*58*(3), 243-251. https://doi.org/10.1017/S0016672300029992

**Fixation probability in spatially changing environments.** / Tachida, Hidenori; Iizuka, Masaru.

Research output: Contribution to journal › Article

*Genetical Research*, vol. 58, no. 3, pp. 243-251. https://doi.org/10.1017/S0016672300029992

}

TY - JOUR

T1 - Fixation probability in spatially changing environments

AU - Tachida, Hidenori

AU - Iizuka, Masaru

PY - 1991/1/1

Y1 - 1991/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0026352872&partnerID=8YFLogxK

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U2 - 10.1017/S0016672300029992

DO - 10.1017/S0016672300029992

M3 - Article

C2 - 1802806

AN - SCOPUS:0026352872

VL - 58

SP - 243

EP - 251

JO - Genetical Research

JF - Genetical Research

SN - 0016-6723

IS - 3

ER -