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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Competition drives evolutionary changes in species coexistence.
  • Theoretical models predicting these eco-evolutionary dynamics are lacking.

Purpose of the Study:

  • To model the evolution of coexistence components: niche overlap and competitive differences.
  • To investigate how environmental breadth affects these dynamics.

Main Methods:

  • Developed a two-species eco-evolutionary model.
  • Incorporated consumer-resource interactions and quantitative genetic inheritance.
  • Simulated trait evolution along a one-dimensional axis.

Main Results:

  • Broader environments reduce niche overlap and enhance coexistence.
  • Coexistence is maintained by changes in either niche overlap or competitive differences, but rarely both simultaneously.
  • Evolution can be detrimental to coexistence by altering competitive differences.

Conclusions:

  • Eco-evolutionary dynamics significantly shape species coexistence.
  • Environmental breadth is a key factor influencing the outcome of competition.
  • Evolutionary changes in competitive traits can paradoxically reduce species diversity.