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The developmental pathways for Pheidole ant supersoldiers are retained, allowing this ancestral phenotype to reappear when selection pressures favor their re-emergence. This highlights the persistence of developmental plasticity in ant societies.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Entomology

Background:

  • Pheidole ants exhibit remarkable caste polymorphism, including large-brained supersoldiers.
  • The genetic and developmental basis for caste determination is complex and influenced by environmental factors.
  • The potential for ancestral traits to be re-expressed under specific conditions is a key concept in evolutionary developmental biology.

Purpose of the Study:

  • To investigate the retention of developmental plasticity for ancestral supersoldier phenotypes in Pheidole ants.
  • To determine if the capacity for supersoldier development can be re-activated after periods of relaxed selection.
  • To understand the evolutionary implications of retained developmental pathways in social insects.

Main Methods:

  • Experimental manipulation of selection pressures for supersoldiers in Pheidole ant colonies.
  • Comparative analysis of caste development under different environmental conditions.
  • Genetic and molecular analyses to identify pathways involved in supersoldier development.

Main Results:

  • The ancestral supersoldier phenotype was successfully recovered when selection for supersoldiers was reintroduced.
  • Evidence suggests that the developmental potential for supersoldier pathways remains latent within the genome.
  • Colonies previously lacking supersoldiers could regenerate them under renewed selection.

Conclusions:

  • The developmental plasticity for Pheidole ant supersoldier caste is retained across generations.
  • This retention allows for the rapid re-establishment of ancestral phenotypes in response to environmental changes.
  • Understanding these retained pathways offers insights into caste evolution and developmental flexibility in social insects.