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Trade-off shapes diversity in eco-evolutionary dynamics.

Farnoush Farahpour1, Mohammadkarim Saeedghalati1, Verena S Brauer2

  • 1Bioinformatics and Computational Biophysics, University of Duisburg-Essen, Essen, Germany.

Elife
|August 18, 2018
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Summary

A new eco-evolutionary model reveals how life-history trade-offs shape species diversity. The Interaction- and Trade-off-based Eco-Evolutionary Model (ITEEM) shows how competition drives structured communities with high, sustained diversity.

Keywords:
competitioncomputational biologydiversity and coexistenceeco-evolutionary modelecologyevolving interaction networkiInteraction spacenonesystems biologytrade-off

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Understanding the interplay between ecological interactions and evolutionary processes is crucial for explaining biodiversity patterns.
  • Life-history trade-offs, such as between replication rate and competitive ability, are fundamental constraints on species evolution.

Purpose of the Study:

  • To introduce and analyze an Interaction- and Trade-off-based Eco-Evolutionary Model (ITEEM).
  • To investigate the impact of trade-off shapes on eco-evolutionary dynamics and community structure.

Main Methods:

  • Development of a minimalist eco-evolutionary model (ITEEM) for competing species in a well-mixed system.
  • Analysis of trait evolution under a life-history trade-off between replication and competitive ability.
  • Identification of distinct phases of diversity and phase transitions driven by trade-off geometry.

Main Results:

  • The shape of the life-history trade-off fundamentally influences eco-evolutionary dynamics.
  • ITEEM predicts four distinct phases of diversity, including a sharp phase transition.
  • The model self-organizes towards structured communities with high and sustained diversity.
  • Competing species form interaction cycles resembling rock-paper-scissors dynamics.

Conclusions:

  • Minimalist eco-evolutionary models can capture complex, observed ecological and evolutionary patterns.
  • Trade-off shapes are critical determinants of community structure and biodiversity maintenance.
  • ITEEM provides a framework for understanding self-organization and emergent diversity in ecological systems.