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Phenotypic variability promotes diversity and stability in competitive communities.

Daniel S Maynard1,2, Carlos A Serván1, José A Capitán3

  • 1Department of Ecology & Evolution, University of Chicago, Chicago, IL, USA.

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Summary

Intraspecific variation, or differences within a species, stabilizes ecological communities. This phenotypic variability enhances biodiversity and robustness, even at low levels, by buffering against population changes.

Keywords:
Intraspecific variationLotka-Volterra dynamicscoexistencenetwork theoryreplicator dynamics

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Intraspecific variation is central to evolutionary theory.
  • Ecological expectations for how intraspecific variation impacts community dynamics are limited.
  • Understanding biodiversity maintenance is a key ecological challenge.

Discussion:

  • Phenotypic variability, when integrated into competitive networks using evolutionary game theory, significantly alters ecological dynamics.
  • This variability leads to system stabilization and buffers communities against demographic disturbances.
  • The stabilizing effects are most pronounced with greater phenotypic differences and moderate inheritance fidelity.

Key Insights:

  • Even low levels of intraspecific variation substantially increase community diversity, stability, and robustness.
  • Phenotypic variability acts as a simple, ubiquitous stabilizing force in competitive ecological communities.
  • This research provides a foundational understanding of biological diversity maintenance in nature.

Outlook:

  • Further research can explore the quantitative relationships between specific phenotypic traits and community stability.
  • Investigating the role of intraspecific variation in different ecosystem types and across various timescales.
  • Applying these findings to conservation biology and ecosystem management strategies.