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Updated: May 10, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
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Repeated parallel evolution reveals limiting similarity in subterranean diving beetles.

Remi Vergnon1, Remko Leijs, Egbert H van Nes

  • 1Department of Aquatic Ecology and Water Quality Management, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, The Netherlands. remi.vergnon@wur.nl

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Summary

Coexisting species evolve to be regularly spaced in body size, supporting the limiting similarity theory. This self-organization shapes ecological communities, even with diverse origins.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Community Ecology

Background:

  • The theory of limiting similarity posits that coexisting species must be distinct to coexist.
  • Empirical evidence for this ecological theory has been limited.
  • Understanding species coexistence is crucial for community ecology.

Purpose of the Study:

  • To test the theory of limiting similarity using empirical data from isolated communities.
  • To investigate the role of evolutionary self-organization in shaping community structure.
  • To determine if body size regularity is a common feature across isolated communities.

Main Methods:

  • Examined 34 subterranean beetle communities in isolated Australian arid habitats.
  • Analyzed body size distributions and spacing of coexisting species.
  • Utilized evolutionary modeling starting with random founder species sets.

Main Results:

  • Communities consistently exhibited regular spacing of species along the body size axis.
  • Average size ratio between coexisting species was 1.6.
  • Absolute body sizes varied significantly between communities, but relative spacing was conserved.

Conclusions:

  • Findings support the theory of limiting similarity, driven by evolutionary self-organization.
  • Body size regular spacing suggests a general mechanism shaping ecological communities.
  • The model predicts compatibility of limiting similarity with coexistence of multiple redundant species in less isolated habitats.