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Collection and Long-Term Maintenance of Leaf-Cutting Ants Atta in Laboratory Conditions
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  • 1Centre for Social Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark. spadenboer@bio.ku.dk

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Summary

Leaf-cutter ant queens fertilize nearly all eggs using stored sperm. Sperm use per egg increases with queen age, and sperm quality declines over time, impacting colony lifespan.

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Area of Science:

  • Reproductive Biology
  • Animal Behavior
  • Evolutionary Ecology

Background:

  • Female sperm storage is common but its impact on life history is understudied.
  • Ant queens mate once and store sperm for years to reproduce.

Purpose of the Study:

  • Investigate sperm use dynamics in Atta colombica queens.
  • Determine how sperm storage affects queen reproductive success and colony development.

Main Methods:

  • Observed sperm use during egg fertilization in Atta colombica.
  • Analyzed sperm robustness and its decline over storage duration.
  • Utilized a heuristic model to estimate sperm reserves and colony lifespan.

Main Results:

  • Queens fertilize ~100% of eggs with minimal sperm per egg.
  • Sperm use per egg increases with queen age.
  • Stored sperm robustness decreases with storage time, indicating senescence.

Conclusions:

  • Atta colombica queens optimize sperm expenditure.
  • Sperm depletion is a likely factor in mature colony mortality.
  • Queen age and sperm senescence significantly influence reproductive potential and colony longevity.