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Collection and Long-Term Maintenance of Leaf-Cutting Ants Atta in Laboratory Conditions
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Caste development and evolution in ants: it's all about size.

Waring Trible1, Daniel J C Kronauer2

  • 1Laboratory of Social Evolution and Behavior, The Rockefeller University, New York, NY 10065, USA wtrible@rockefeller.edu.

The Journal of Experimental Biology
|January 7, 2017
PubMed
Summary

Female ants develop different castes based on size, with larger ants exhibiting more queen-like traits. This size-dependent theory explains caste evolution and development across ant species.

Keywords:
Body sizeEvolutionary developmental biologyFormicidaeIntercastePhenotypic plasticityPolyphenism

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Area of Science:

  • * Evolutionary biology
  • * Developmental biology
  • * Entomology

Background:

  • * Female ants exhibit diverse morphological castes (workers, soldiers, queens).
  • * Caste development is influenced by genetic and environmental factors.
  • * Ant castes show significant variation across species and evolutionary history.

Purpose of the Study:

  • * To propose a unifying theory for ant caste development and evolution.
  • * To explain caste diversity as a function of individual size.
  • * To provide a framework for investigating the molecular basis of caste.

Main Methods:

  • * Theoretical synthesis of existing data on ant morphology and development.
  • * Analysis of the relationship between individual size and caste-associated traits.
  • * Examination of how size-frequency distributions and growth associations influence caste realization.

Main Results:

  • * A theory positing that female ant morphology varies with size, with larger individuals displaying queen-like traits.
  • * Caste development mechanisms are interpreted as size-influencing factors.
  • * Phenotypic space illustrates trait combinations possible within and across castes.

Conclusions:

  • * Ant caste evolution involves modifications to the size-dependent phenotypic space.
  • * Changes in size-frequency distribution or growth-size associations drive caste diversification.
  • * This size-centric theory unifies understanding of ant caste development and evolution.