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Sibling bullying during infancy does not make wimpy adults
Oscar Sánchez-Macouzet1, Hugh Drummond
1Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, México. o.sanchezmacouzet@gmail.com
Biology Letters
|June 24, 2011
Summary
Early life subordination in blue-footed booby chicks does not impact adult aggressiveness. This suggests developmental traits like aggression may be resilient to typical infant challenges.
Area of Science:
- Animal Behavior
- Developmental Biology
- Ornithology
Background:
- Dominance hierarchies in infancy are hypothesized to influence adult agonistic behavior.
- Early adverse conditions can have lasting effects on various animal traits, including competitive behavior.
- Sibling competition within a dominance hierarchy is a common developmental setting for many vertebrates.
Purpose of the Study:
- To investigate whether subordination during infancy affects adult aggressiveness in blue-footed boobies.
- To test the long-term impact of early social status on agonistic potential in a long-lived species.
Main Methods:
- Studied blue-footed booby chicks, noting their dominance rank within sibling pairs.
- Assessed adult aggressiveness by observing nest defense against conspecific intruders.
- Compared aggressiveness of former junior (subordinate) and senior (dominant) chicks years later.
Main Results:
- Subordination to an aggressive sibling during infancy did not compromise adult aggressiveness.
- Former junior and senior chicks showed no significant difference in nest defense behavior.
- Aggressiveness in adult blue-footed boobies was not prejudiced by early life subordination, food deprivation, or stress.
Conclusions:
- Early life subordination and its associated challenges do not necessarily impair adult aggressiveness in blue-footed boobies.
- Aggressive tendencies may be buffered against predictable infant challenges, demonstrating developmental resilience.
- Findings suggest that early social experiences, while potentially stressful, may not permanently alter adult aggressive behavior in this species.
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