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Buffered development: resilience after aggressive subordination in infancy.

Hugh Drummond1, Roxana Torres, V V Krishnan

  • 1Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70-275, México DF 4510, México. hugh@servidor.unam.mx

The American Naturalist
|July 15, 2003
PubMed
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Aggressive dominance in blue-footed booby chicks does not improve future reproductive success. Subordinate chicks, despite initial disadvantages, may develop resilience, showing comparable or even improved long-term outcomes.

Area of Science:

  • Behavioral Ecology
  • Evolutionary Biology
  • Ornithology

Background:

  • Sibling interactions, including dominance and subordination, are common in vertebrate broods.
  • The long-term consequences of early-life dominance hierarchies on reproductive success are not fully understood.

Purpose of the Study:

  • To investigate the effects of aggressive dominance and subordination on the development and long-term reproductive success of blue-footed booby (Sula nebouxii) fledglings.

Main Methods:

  • Analysis of 1,167 fledglings from two-chick broods of blue-footed boobies.
  • Tracking of dominance status, fledging success, recruitment, and reproductive output over 10 years.

Main Results:

  • Dominant fledglings did not show higher recruitment rates or improved reproductive success compared to subordinates.

Related Experiment Videos

  • Subordinate fledglings experienced less prejudice from late hatching and established clutches earlier.
  • Subordinate recruits had larger broods in the first 5 years, but overall reproductive success up to age 5 was similar for both groups.

    • Conclusions:

    • Exercising dominance in infancy does not confer future advantages and may incur long-term costs.
    • Experiencing subordination may have neutral or even beneficial effects, potentially enhancing adult resilience and reproductive outcomes.