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Disentangling eco-evolutionary effects on trait fixation.

Peter Czuppon1, Chaitanya S Gokhale2

  • 1Department of Evolutionary Theory, Max Planck Institute for Evolutionary Biology, August-Thienemann-Str. 2, 24306, Plön, Germany.

Theoretical Population Biology
|October 26, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new model for trait fixation in changing populations, revealing that ecological and evolutionary factors are deeply intertwined. These entangled eco-evolutionary processes are crucial for understanding fixation probabilities in co-evolutionary systems.

Keywords:
Competitive Lotka–Volterra modelEco-evolutionEvolutionary game theoryFixation probabilitySocial dilemmaStochastic diffusion

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Theoretical Ecology
  • Game Theory

Background:

  • Traditional models often analyze trait fixation under frequency-independent selection or fixed population sizes.
  • Limited attention has been given to combining demographic fluctuations with frequency-dependent interactions like Lotka-Volterra dynamics.
  • Understanding trait fixation in dynamic populations with complex interactions is a significant challenge.

Purpose of the Study:

  • To investigate trait fixation probabilities in a stochastic, competitive Lotka-Volterra model with higher-order interactions.
  • To explore the interplay between demographic changes and frequency-dependent selection.
  • To disentangle and analyze the ecological and evolutionary components of selection.

Main Methods:

  • Development of an individual-based model incorporating stochastic fluctuations in trait frequencies and population size.
  • Analysis of a stochastic, competitive Lotka-Volterra model with higher-order interactions.
  • Calculation of trait fixation probabilities under varying competition coefficients.

Main Results:

  • Fixation probabilities qualitatively resemble deterministic evolutionary dynamics.
  • Ecological and evolutionary selection effects are not easily separable, influencing each other dynamically.
  • A nested interaction between evolutionary and ecological effects was identified.

Conclusions:

  • A clean separation of ecological and evolutionary effects is not feasible in these systems.
  • Entangled eco-evolutionary processes are essential for accurately determining fixation properties.
  • The study highlights the necessity of considering integrated eco-evolutionary dynamics in co-evolutionary systems.