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Updated: Mar 1, 2026

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A THEORY OF FAUNAL BUILDUP FOR COMPETITION COMMUNITIES.

John D Rummel1, Jonathan Roughgarden1

  • 1Department of Biological Sciences, Stanford University, Stanford, CA, 94305.

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Invasion-structured communities harbor more species than coevolution-structured ones. Coevolutionary processes lead to community cycling, explaining species distribution patterns and theoretical ecological cycles.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Ecological communities are structured by species interactions, influencing diversity and stability.
  • Niche separation patterns are key to understanding community assembly and coexistence.
  • Previous models have explored community assembly through invasion and coevolutionary dynamics.

Purpose of the Study:

  • To compare species richness and niche packing in invasion-structured versus coevolution-structured communities.
  • To investigate the role of asymmetric competition in community assembly and stability.
  • To provide a theoretical basis for observed ecological patterns, such as the taxon cycle and Anolis lizard distribution.

Main Methods:

  • Simulated community assembly using invasion-only and coevolutionary algorithms.
  • Analyzed species packing along a resource axis.
  • Examined niche separation patterns and community cycling dynamics.

Main Results:

  • Invasion-structured communities exhibited higher species richness and tighter niche packing than coevolution-structured communities.
  • Coevolution-structured communities were more stable but more susceptible to invasion.
  • Niche separation patterns differed significantly from random, with specific ranges observed under different assembly rules.
  • Coevolutionary algorithms, particularly with asymmetric competition, demonstrated community cycling.

Conclusions:

  • Community structure is significantly influenced by the mode of assembly (invasion vs. coevolution).
  • Coevolutionary dynamics can generate cyclical patterns, offering explanations for ecological phenomena like the taxon cycle.
  • Niche separation patterns, while variable, can emerge as ensemble properties of community assembly processes.