The Bruce Effect: An Evaluation of Male/Female Advantages

@article{Schwagmeyer1979TheBE,
  title={The Bruce Effect: An Evaluation of Male/Female Advantages},
  author={Patricia L. Schwagmeyer},
  journal={The American Naturalist},
  year={1979},
  volume={114},
  pages={932 - 938}
}

Pregnancy Blocking in Rodents: Adaptive Advantages for Females

  • J. Labov
  • Biology
    The American Naturalist
  • 1981
TLDR
Arguments are presented here that pregnancy blocking may have actually evolved as a female mechanism to minimize parental investment in offspring which are potentially susceptible to infanticide by the strange male.

How to escape male infanticide: mechanisms for avoiding or terminating pregnancy in mammals

The phenomenon whereby pregnancy may be inhibited or terminated when a female is exposed to non-sire males after mating is often, and rather generally, referred to as the ‘Bruce effect’. Widespread

Pregnancy Block from a Female Perspective

TLDR
Consideration of potential female benefits and the implications of female advantage in pregnancy block suggest that this behaviour could evolve with little or no reference to male advantage, and may represent a potential reproductive cost to stud males.

Male-caused failure of female reproduction and its adaptive value in alpine marmots (Marmota marmota)

TLDR
Reducing progesterone levels after the mating period and the lack of evidence for direct infanticide by new territorial males suggest a block of pregnancy as a likely explanation for reproductive failures in groups with male takeovers during gestation.

Exposure to strange adults does not cause pregnancy disruption or infanticide in the gray-tailed vole

TLDR
It is concluded that neither the Bruce effect nor infanticide occurred differentially as a consequence of the treatments in gray-tailed voles, and field verification is recommended for other species of murid rodents that exhibit theBruce effect before the results are applied to evolutionary theory.

Pregnancy block in laboratory mice as a function of male social status.

  • U. Huck
  • Biology
    Journal of reproduction and fertility
  • 1982
TLDR
The hypothesis that dominant male laboratory mice would be more effective in inducing pregnancy blockage than would subordinate males is tested and the possibility that pregnancy block would be less likely to occur in females impregnation by dominant males than in those impregnated by subordinates is tested.

Animal Behavioral Studies, Non-primates

  • H. Kokko
  • Biology, Psychology
    Encyclopedia of Violence, Peace, & Conflict
  • 2022

Intrasexual Selection: How Males Compete

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