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Michael J Wade1, Stephen M Shuster

  • 1Department of Biology, Indiana University, 1001 East 3rd Street, Bloomington, Indiana 47405.

Integrative and Comparative Biology
|June 17, 2011
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Summary
This summary is machine-generated.

Sexual selection favors male promiscuity due to parental investment differences. However, average male and female promiscuity are equal, with fitness variance arising from mating patterns, not just parental investment.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Sexual Selection Theory

Background:

  • Bateman's principle posits sexual selection favors male promiscuity over female promiscuity due to gametic parental investment differences.
  • Bateman also identified sex differences in fitness variance as stemming from variance in male mating success.

Purpose of the Study:

  • To re-evaluate the fundamental source of sexual selection identified by Bateman.
  • To investigate the relationship between male and female promiscuity and its impact on sexual selection dynamics.
  • To challenge the traditional emphasis on parental investment in explaining sex differences in mating behavior.

Main Methods:

  • Theoretical analysis of Bateman's original insights on sexual selection.
  • Mathematical modeling to explore the interdependence of male and female promiscuity at a 1:1 sex ratio.
  • Examination of factors driving sex differences in mating propensity, including covariance between matings and offspring, and Fisherian runaway selection.

Main Results:

  • At a 1:1 sex ratio, average male and female promiscuity must be equal, as each mating involves one male and one female.
  • Sex differences in mating propensity arise from differences in the covariance between matings and offspring number, or from Fisherian runaway sexual selection.
  • Female promiscuity can act as a constraint on the evolution of male promiscuity, contrary to traditional parental investment theory.

Conclusions:

  • Bateman's insight into the source of sexual selection, particularly the variance in mating success, is more fundamental than his speculation on parental investment.
  • The interdependence of male and female mating rates implies that female mating behavior plays a crucial role in shaping sexual selection.
  • Female promiscuity can limit male promiscuity evolution, offering an alternative perspective to parental investment theory in explaining mating patterns.