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Related Experiment Videos

Detecting sexually antagonistic coevolution with population crosses.

Locke Rowe1, Erin Cameron, Troy Day

  • 1Department of Zoology, University of Toronto, Toronto, Ontario M5S 3G5, Canada. lrowe@zoo.utoronto.ca

Proceedings. Biological Sciences
|October 17, 2003
PubMed
Summary

Population crosses reveal that interactions do not always indicate complex sexual signaling systems. Females may not always benefit most from mating with their own males under sexually antagonistic coevolution.

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Area of Science:

  • Evolutionary biology
  • Sexual selection
  • Coevolutionary dynamics

Background:

  • Population crosses are used to study sexual coevolution.
  • Two hypotheses from sexually antagonistic coevolution theory are tested.

Purpose of the Study:

  • To test hypotheses about sexual coevolution using population crosses.
  • To determine if statistical interactions indicate complex signal/receiver systems.
  • To assess if females benefit most from mating with their own males under sexual antagonism.

Main Methods:

  • Crossing strains from a formal model of sexually antagonistic coevolution.
  • Analyzing traits like mating rate, oviposition rate, and survivorship.
  • Modeling a single male signal and an evolving female receptor preference function.

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Main Results:

  • Statistical interactions were not consistently supported as indicators of complex signal/receiver systems.
  • Females did not consistently achieve higher fitness when mated with males from their own strains.
  • Results challenge the interpretation of previous experiments on sexual coevolution.

Conclusions:

  • Interactions in population crosses are not definitive proof of complex sexual signaling.
  • The assumption that females always benefit most from mating with 'own' males under sexual antagonism may be flawed.
  • Findings impact theories of speciation driven by sexually antagonistic coevolution.