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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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Sympatric speciation in structureless environments.

Wayne M Getz1,2, Richard Salter3, Dana Paige Seidel4

  • 1Department ESPM, University of California, Berkeley, CA, 94720-3114, USA. wgetz@berkeley.edu.

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|March 1, 2016
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Summary
This summary is machine-generated.

Sympatric speciation, the evolution of new species from a single ancestral species coexisting in the same geographic area, can occur even without distinct ecological niches. Our model shows mating behavior can drive this process in mobile organisms.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Theoretical Ecology

Background:

  • Sympatric speciation was historically considered unlikely by Darwin and Modern Synthesis proponents.
  • Recent evidence suggests sympatric speciation is possible under specific ecological conditions, particularly intraspecific competition for structured resources.

Purpose of the Study:

  • To investigate the evolution of mating behavior as a driver of sympatric speciation using an individual-based population model.
  • To explore how foraging strategies and mate choice interact to influence speciation.

Main Methods:

  • An individual-based population model with variable foraging strategies and a mate-choice (m-trait) gene was developed.
  • Simulations incorporated three diallelic foraging strategy genes and one m-trait gene.
  • Fitness was determined by individual biomass, with spatial variation induced by foraging.

Main Results:

  • Under non-random mating, the m-trait gene influenced mating patterns (assortative or disassortative) based on its frequency.
  • Evolutionary simulations showed the m-trait gene evolved to promote assortative mating.
  • Heterozygous individuals had lower fitness than homozygous individuals, driving assortative mating.

Conclusions:

  • Sympatric speciation can evolve even in the absence of niche differentiation or resource gradients.
  • The model's simplicity and generality suggest sympatric speciation may be more common in mobile, sexually reproducing organisms than previously assumed.