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Adaptation to an extraordinary environment by evolution of phenotypic plasticity and genetic assimilation

Journal of evolutionary biology, 2009-07, Vol.22 (7), p.1435-1446 [Peer Reviewed Journal]

2009 The Author. Journal Compilation © 2009 European Society For Evolutionary Biology ;ISSN: 1010-061X ;EISSN: 1420-9101 ;DOI: 10.1111/j.1420-9101.2009.01754.x ;PMID: 19467134

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  • Title:
    Adaptation to an extraordinary environment by evolution of phenotypic plasticity and genetic assimilation
  • Author: LANDE, R
  • Subjects: Animals ; Baldwin effect ; biocontrol ; biological control ; Biological Evolution ; canalization ; Environment ; environmental predictability ; Evolutionary biology ; extreme environment ; fluctuating environment ; Genotype & phenotype ; Habitats ; Models, Genetic ; norm of reaction ; Phenotype ; Selection, Genetic ; species invasions ; stabilizing selection
  • Is Part Of: Journal of evolutionary biology, 2009-07, Vol.22 (7), p.1435-1446
  • Description: Adaptation to a sudden extreme change in environment, beyond the usual range of background environmental fluctuations, is analysed using a quantitative genetic model of phenotypic plasticity. Generations are discrete, with time lag τ between a critical period for environmental influence on individual development and natural selection on adult phenotypes. The optimum phenotype, and genotypic norms of reaction, are linear functions of the environment. Reaction norm elevation and slope (plasticity) vary among genotypes. Initially, in the average background environment, the character is canalized with minimum genetic and phenotypic variance, and no correlation between reaction norm elevation and slope. The optimal plasticity is proportional to the predictability of environmental fluctuations over time lag τ. During the first generation in the new environment the mean fitness suddenly drops and the mean phenotype jumps towards the new optimum phenotype by plasticity. Subsequent adaptation occurs in two phases. Rapid evolution of increased plasticity allows the mean phenotype to closely approach the new optimum. The new phenotype then undergoes slow genetic assimilation, with reduction in plasticity compensated by genetic evolution of reaction norm elevation in the original environment.
  • Publisher: Oxford, UK: Oxford, UK : Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 1010-061X
    EISSN: 1420-9101
    DOI: 10.1111/j.1420-9101.2009.01754.x
    PMID: 19467134
  • Source: MEDLINE
    Alma/SFX Local Collection
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