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Pathogen evolution in finite populations: slow and steady spreads the best.

ABSTRACT: The theory of life-history evolution provides a powerful framework to understand the evolutionary dynamics of pathogens. It assumes, however, that host populations are large and that one can neglect the effects of demographic stochasticity. Here, we expand the theory to account for the effects of finite population size on the evolution of pathogen virulence. We show that demographic stochasticity introduces additional evolutionary forces that can qualitatively affect the dynamics and the evolutionary outcome. We discuss the importance of the shape of the pathogen fitness landscape on the balance between mutation, selection and genetic drift. This analysis reconciles Adaptive Dynamics with population genetics in finite populations and provides a new theoretical toolbox to study life-history evolution in realistic ecological scenarios.

SUBMITTER: Parsons TL

PROVIDER: S-EPMC6228476 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Pathogen evolution in finite populations: slow and steady spreads the best.

Parsons Todd L TL Lambert Amaury A Day Troy T Gandon Sylvain S

Journal of the Royal Society, Interface 20181003 147

The theory of life-history evolution provides a powerful framework to understand the evolutionary dynamics of pathogens. It assumes, however, that host populations are large and that one can neglect the effects of demographic stochasticity. Here, we expand the theory to account for the effects of finite population size on the evolution of pathogen virulence. We show that demographic stochasticity introduces additional evolutionary forces that can qualitatively affect the dynamics and the evoluti ...[more]

PMID: 30282758

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