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Related Experiment Videos

Kin competition within groups: the offspring depreciation hypothesis.

J Ridley1, W J Sutherland

  • 1Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK. j.ridley@uea.ac.uk

Proceedings. Biological Sciences
|February 8, 2003
PubMed
Summary

Kin competition drives dispersal, but only when resources are shared equally. Offspring depreciation from sibling queues alters this, favoring higher dispersal and smaller clutch sizes in cooperatively breeding birds.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Population dynamics

Background:

  • Kin competition can influence dispersal strategies, favoring emigration when resources are equally shared among relatives.
  • Increased dominance hierarchies within families can reduce or eliminate the kin competition effect on dispersal.

Purpose of the Study:

  • To investigate how dominance hierarchies and offspring depreciation affect the evolution of dispersal rates in family groups.
  • To explain the use of ecological traps (sinks) by cooperatively breeding birds.

Main Methods:

  • Theoretical modeling of family groups with dominance hierarchies and queuing for breeding positions.
  • Analysis of how offspring rank depreciation impacts individual fitness and dispersal decisions.

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Main Results:

  • The kin competition effect on dispersal is restored when siblings queue for breeding, due to offspring rank depreciation.
  • Offspring depreciation leads to shorter queues, increased dispersal rates, and smaller, consistent clutch sizes.
  • This model explains why cooperatively breeding birds use sinks in stable environments.

Conclusions:

  • Offspring depreciation is a key factor in understanding dispersal evolution within dominance-ranked family groups.
  • The model reconciles theoretical predictions with observed behaviors in cooperatively breeding species.
  • This mechanism favors reproductive skew and constrains the evolution of alloparenting.