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Related Experiment Videos

Reproductive skew and indiscriminate infanticide.

Johnstone1, Cant

  • 1Department of Zoology, University of Cambridge

Animal Behaviour
|May 18, 1999
PubMed
Summary

Infanticide can evolve in communally breeding animals, even without offspring recognition. This behavior can reduce reproductive conflict and increase overall group productivity by optimizing brood size.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Game theory

Background:

  • Communal breeding presents an evolutionary conflict over reproduction within groups.
  • Dominant individuals may not fully control subordinate reproduction, potentially favoring infanticide.

Purpose of the Study:

  • To model the evolutionarily stable strategy (ESS) of reproductive partitioning in communally breeding animals.
  • To investigate the conditions under which infanticide evolves, particularly when offspring discrimination is difficult.

Main Methods:

  • Development of an evolutionarily stable strategy (ESS) model.
  • Analysis of reproductive partitioning and infanticide dynamics.

Main Results:

  • Infanticide can be evolutionarily favored even without the ability to discriminate between own and cobreeders' offspring.
  • Infanticide is more likely to be stable when relatedness between cobreeders is low and offspring production costs are low.
  • Infanticide can lead to reduced reproductive skew by releasing subordinates from reproductive restraint.
  • Elevated offspring production is often associated with infanticide, with excess young being eliminated to maintain optimal brood size.

Conclusions:

  • The possibility of infanticide can influence reproductive patterns in groups, even if no offspring are killed at equilibrium.
  • Infanticide can resolve conflicts over reproduction in communal breeding systems, potentially increasing overall group success.

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