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Dominance between booby nestlings involves winner and loser effects

Drummond1, Canales

  • 1Instituto de Ecología, Universidad Nacional Autónoma de México

Animal Behaviour
|December 16, 1998
PubMed
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Early social experiences significantly shape agonistic behavior in blue-footed booby chicks. Both dominant and subordinate chicks show altered aggression levels, with subordinate training having more lasting effects.

Area of Science:

  • Animal behavior
  • Ornithology
  • Behavioral ecology

Background:

  • Blue-footed booby (Sula nebouxii) chicks typically form stable dominance hierarchies.
  • Senior chicks are usually dominant and aggressive, while junior chicks are submissive.

Purpose of the Study:

  • To investigate the impact of early social experience on agonistic tendencies in blue-footed booby chicks.
  • To determine if social roles (dominant/subordinate) influence behavioral development.

Main Methods:

  • Cross-fostering of 2-3 week old chicks to pair subordinates and dominants with singletons.
  • Observation and recording of agonistic encounters and behavioral patterns post-pairing.

Main Results:

  • Subordinate chicks exhibited reduced aggression and increased submissiveness compared to singletons.

Related Experiment Videos

  • Dominant chicks displayed significantly higher aggression levels than singletons.
  • While dominant chicks initially showed increased aggression, their winning proportion decreased over time, indicating a reversible effect.

    • Conclusions:

    • Early social experiences exert a strong, yet reversible, training effect on agonistic behavior in blue-footed booby chicks.
    • Subordinate training appears to have more persistent effects than dominant training, potentially due to experimental conditions.