Environmental variation, fluctuating selection and genetic drift in subdivided populations

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Although there have many studies of the population genetical consequences of environmental variation, little is known about the combined effects of genetic drift and fluctuating selection in structured populations. Here we use diffusion theory to investigate the effects of temporally and spatially varying selection on a population of haploid individuals subdivided into a large number of demes. Using a perturbation method for processes with multiple time scales, we show that as the number of demes tends to infinity, the overall frequency converges to a diffusion process that is also the diffusion approximation for a finite, panmictic population subject to temporally fluctuating selection. We find that the coefficients of this process have a complicated dependence on deme size and migration rate, and that changes in these demographic parameters can determine both the balance between the dispersive and stabilizing effects of environmental variation and whether selection favors alleles with lower or higher fitness variance.

Original languageEnglish (US)
Pages (from-to)233-250
Number of pages18
JournalTheoretical Population Biology
Volume74
Issue number3
DOIs
StatePublished - Oct 2008
Externally publishedYes

Fingerprint

genetic drift
haploidy
allele
fitness
demographic statistics
perturbation
alleles
timescale
effect
methodology

Keywords

  • Diffusion approximation
  • Environmental variation
  • Fluctuating selection
  • Genetic drift
  • Island model
  • Levene model
  • Population subdivision

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Environmental variation, fluctuating selection and genetic drift in subdivided populations. / Taylor, Jesse.

In: Theoretical Population Biology, Vol. 74, No. 3, 10.2008, p. 233-250.

Research output: Contribution to journalArticle

@article{a205c619cac446699b5d849dd47811a0,
title = "Environmental variation, fluctuating selection and genetic drift in subdivided populations",
abstract = "Although there have many studies of the population genetical consequences of environmental variation, little is known about the combined effects of genetic drift and fluctuating selection in structured populations. Here we use diffusion theory to investigate the effects of temporally and spatially varying selection on a population of haploid individuals subdivided into a large number of demes. Using a perturbation method for processes with multiple time scales, we show that as the number of demes tends to infinity, the overall frequency converges to a diffusion process that is also the diffusion approximation for a finite, panmictic population subject to temporally fluctuating selection. We find that the coefficients of this process have a complicated dependence on deme size and migration rate, and that changes in these demographic parameters can determine both the balance between the dispersive and stabilizing effects of environmental variation and whether selection favors alleles with lower or higher fitness variance.",
keywords = "Diffusion approximation, Environmental variation, Fluctuating selection, Genetic drift, Island model, Levene model, Population subdivision",
author = "Jesse Taylor",
year = "2008",
month = "10",
doi = "10.1016/j.tpb.2008.07.005",
language = "English (US)",
volume = "74",
pages = "233--250",
journal = "Theoretical Population Biology",
issn = "0040-5809",
publisher = "Academic Press Inc.",
number = "3",

}

TY - JOUR

T1 - Environmental variation, fluctuating selection and genetic drift in subdivided populations

AU - Taylor, Jesse

PY - 2008/10

Y1 - 2008/10

N2 - Although there have many studies of the population genetical consequences of environmental variation, little is known about the combined effects of genetic drift and fluctuating selection in structured populations. Here we use diffusion theory to investigate the effects of temporally and spatially varying selection on a population of haploid individuals subdivided into a large number of demes. Using a perturbation method for processes with multiple time scales, we show that as the number of demes tends to infinity, the overall frequency converges to a diffusion process that is also the diffusion approximation for a finite, panmictic population subject to temporally fluctuating selection. We find that the coefficients of this process have a complicated dependence on deme size and migration rate, and that changes in these demographic parameters can determine both the balance between the dispersive and stabilizing effects of environmental variation and whether selection favors alleles with lower or higher fitness variance.

AB - Although there have many studies of the population genetical consequences of environmental variation, little is known about the combined effects of genetic drift and fluctuating selection in structured populations. Here we use diffusion theory to investigate the effects of temporally and spatially varying selection on a population of haploid individuals subdivided into a large number of demes. Using a perturbation method for processes with multiple time scales, we show that as the number of demes tends to infinity, the overall frequency converges to a diffusion process that is also the diffusion approximation for a finite, panmictic population subject to temporally fluctuating selection. We find that the coefficients of this process have a complicated dependence on deme size and migration rate, and that changes in these demographic parameters can determine both the balance between the dispersive and stabilizing effects of environmental variation and whether selection favors alleles with lower or higher fitness variance.

KW - Diffusion approximation

KW - Environmental variation

KW - Fluctuating selection

KW - Genetic drift

KW - Island model

KW - Levene model

KW - Population subdivision

UR - http://www.scopus.com/inward/record.url?scp=52949144937&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=52949144937&partnerID=8YFLogxK

U2 - 10.1016/j.tpb.2008.07.005

DO - 10.1016/j.tpb.2008.07.005

M3 - Article

VL - 74

SP - 233

EP - 250

JO - Theoretical Population Biology

JF - Theoretical Population Biology

SN - 0040-5809

IS - 3

ER -