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Related Experiment Videos

Sexual cooperation: mating increases longevity in ant queens.

Alexandra Schrempf1, Jürgen Heinze, Sylvia Cremer

  • 1Biologie I, Universität Regensburg, Universitätsstrasse 31, D-93040 Regensburg, Germany.

Current Biology : CB
|February 8, 2005
PubMed
Summary

In ants, mating benefits both males and females, promoting queen longevity and early egg-laying. This study reveals unexpected sexual cooperation, challenging evolutionary theories of aging in Cardiocondyla obscurior.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Social insects

Background:

  • Sexual conflict arises from differing male and female reproductive interests.
  • In many species, male seminal fluids harm female longevity for increased fecundity.
  • Ant life history, with queens mating once and storing sperm, may reduce sexual conflict.

Purpose of the Study:

  • To investigate the impact of mating on queen longevity and reproduction in the ant Cardiocondyla obscurior.
  • To determine if sexual conflict or cooperation exists in ant mating systems.
  • To test evolutionary theories of aging in the context of ant reproduction.

Main Methods:

  • Comparative study of mated versus virgin Cardiocondyla obscurior queens.
  • Analysis of queen longevity, egg-laying onset, and fecundity.

Related Experiment Videos

  • Experimental manipulation using fertile and sterilized males.

    • Main Results:

    • Mating positively affected lifetime reproductive success in queens.
    • Queens mated to fertile or sterilized males lived longer and laid eggs earlier than virgin queens.
    • Only queens receiving viable sperm showed increased fecundity, with no trade-off between longevity and fecundity.

    Conclusions:

    • Ant mating in Cardiocondyla obscurior demonstrates sexual cooperation, not conflict.
    • The absence of a fecundity-longevity trade-off challenges established evolutionary theories of aging.
    • Ant queens' lifelong commitment to mates benefits both sexes, promoting mutual reproductive success.