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Related Experiment Videos

Population size and molecular evolution on islands.

Megan Woolfit1, Lindell Bromham

  • 1Department of Genetics, Trinity College, University of Dublin, Dublin 2, Ireland. woolfitm@tcd.ie

Proceedings. Biological Sciences
|September 30, 2005
PubMed
Summary

Island species show more non-synonymous mutations than mainland species, supporting the nearly neutral theory of molecular evolution. This suggests smaller effective population sizes on islands drive fixation of these mutations.

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Area of Science:

  • Evolutionary Biology
  • Molecular Evolution
  • Population Genetics

Background:

  • The nearly neutral theory posits that effective population size (Ne) influences molecular evolution rates.
  • Small populations are predicted to accumulate more slightly deleterious mutations due to genetic drift.
  • Empirical testing is challenging due to the difficulty in finding comparable lineages differing solely in Ne.

Purpose of the Study:

  • To empirically test the nearly neutral theory's prediction regarding the effect of Ne on molecular evolution.
  • To investigate if island endemic species, often with smaller Ne, exhibit altered molecular evolution patterns compared to mainland relatives.

Main Methods:

  • Compiled a dataset of 70 phylogenetically independent island-mainland comparisons across diverse taxa (vertebrates, invertebrates, plants).

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  • Utilized maximum likelihood estimation to quantify molecular evolution rates.
  • Assessed two key measures: overall substitution rate and the ratio of non-synonymous to synonymous substitutions.

    • Main Results:

    • Island lineages exhibited significantly higher ratios of non-synonymous to synonymous substitution rates compared to mainland lineages.
    • This finding aligns with predictions of the nearly neutral theory.
    • No significant difference was observed in overall substitution rates between island and mainland lineages.

    Conclusions:

    • The study provides strong empirical support for the nearly neutral theory's predictions regarding the influence of effective population size on the pattern of molecular evolution.
    • Island endemic species serve as valuable models for studying the impact of reduced population size on molecular evolutionary processes.
    • The observed increase in non-synonymous to synonymous substitution ratios in island lineages highlights the role of genetic drift in fixing adaptive and potentially deleterious mutations.