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Lead and behavioral development: parental compensation for behaviorally impaired chicks
1Department of Biological Sciences, Rutgers University, Piscataway, NJ 08855, USA.
Pharmacology, Biochemistry, and Behavior
|November 1, 1996
Summary
Lead exposure in herring gull chicks caused behavioral deficits and reduced survival. However, parents compensated by dividing feeding, ensuring chicks caught up in weight by fledging.
Area of Science:
- Environmental toxicology
- Animal behavior
- Ecology
Background:
- Lead is a ubiquitous environmental contaminant.
- Lead exposure can negatively impact behavioral, physiological, and intellectual development in animals.
- Herring gulls serve as a model organism to study lead's effects in a natural setting.
Purpose of the Study:
- To investigate lead-induced behavioral deficits in young herring gulls.
- To examine parental behavior in response to lead-impaired chicks.
- To assess the impact of lead on sibling competition and parent-offspring conflict.
Main Methods:
- Injected herring gull chicks with lead acetate or saline.
- Observed and compared behavior, weight, and survival of treated and control chicks.
- Monitored parental feeding behavior and brood division in experimental and control nests.
Main Results:
- Lead-injected chicks exhibited impaired righting response, locomotion, thermoregulation, begging, and feeding.
- Lead-exposed chicks had reduced ability to compete for food, leading to significant weight differences.
- Parents exhibited divided feeding strategies, with one parent feeding the healthier chick and the other attending to the lead-impaired chick.
Conclusions:
- Lead exposure induces behavioral deficits and growth retardation in herring gulls in their natural habitat.
- Parental compensation through brood division enhances survival and mitigates weight disadvantages for lead-exposed chicks.
- Herring gull parents can detect differences in offspring size/vigor and adjust behavior to partially compensate for lead-induced deficits.