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Are reproductive skew models evolutionarily stable?

Hanna Kokko1

  • 1Department of Biological and Environmental Science, University of Jyväskylä, FIN-40014 Jyväskylä, Finland. hanna.kokko@jyu.fi

Proceedings. Biological Sciences
|March 5, 2003
PubMed
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Reproductive skew theory relies on hidden assumptions about group formation. Relaxing these assumptions, particularly regarding subordinate knowledge of benefits, can invalidate the theory's predictions in social evolution.

Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Social evolution

Background:

  • Reproductive skew theory is widely used to study social evolution.
  • The theory models group formation and reproductive partitioning among individuals.

Purpose of the Study:

  • To critically evaluate the underlying assumptions of reproductive skew models.
  • To investigate the impact of relaxing key assumptions on model validity and evolutionary stability.

Main Methods:

  • Re-analysis of the basic concessive skew model with staying incentives.
  • Examination of models where subordinates have imperfect knowledge of benefits.

Main Results:

  • The model assumes all-or-nothing dispersal and perfect subordinate knowledge of benefits, which are often unrealistic.

Related Experiment Videos

  • Relaxing the dispersal assumption strengthens the theory, but relaxing the knowledge assumption destabilizes evolutionary outcomes.
  • When subordinates respond to average population benefits, skew model logic fails.

    • Conclusions:

    • Reproductive skew theory's applicability is limited by its strong assumptions.
    • Models should specify behavioral adjustment mechanisms and consider evolutionary versus behavioral time scales.
    • Caution is advised against indiscriminate application, especially in areas like extra-pair paternity models.