Volume 123, Number 4, August 2018
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||03 September 2018|
Polygenic adaptation in changing environments(a)
Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur P.O., Bangalore 560064, India
Received: 9 June 2018
Accepted: 22 August 2018
Although many phenotypic traits are determined by a large number of genetic variants, how a polygenic trait adapts in response to the changes in the environment is still poorly understood. Here we study the adaptation dynamics of a polygenic trait that is determined by a finite number of genetic loci in an infinitely large population which is evolving under stabilising selection and recurrent mutations. We find that in a changing environment, modeled here by a linearly moving phenotypic optimum, the mean trait also moves linearly with time. But its speed is smaller than that of the phenotypic optimum when the effect sizes of the genetic variants are small and approaches that of the environmental change for larger effect sizes. Our study thus highlights the influence of the genetic architecture of a polygenic trait on its adaptability.
PACS: 87.23.-n – Ecology and evolution / 87.23.Kg – Dynamics of evolution / 02.60.-x – Numerical approximation and analysis
© EPLA, 2018
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