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Related Experiment Videos

Declining immunity with age in the wild.

Donna Holmes1, Steven Austad

  • 1Department of Biological Sciences, University of Idaho, Moscow, ID 83844, USA.

Science of Aging Knowledge Environment : SAGE KE
|May 28, 2004
PubMed
Summary

Birds exhibit slower aging and longer lifespans than mammals, with studies revealing age-related immune decline in songbirds. Older barn swallows and collared flycatchers showed reduced antibody responses, impacting offspring health.

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Ornithology

Background:

  • Birds generally exhibit slower aging and longer lifespans compared to similar-sized mammals.
  • Field studies using banding-and-recapture methods track age-related changes in wild bird populations.
  • While advanced senescence is rare in wild birds, physiological deterioration is observed.

Purpose of the Study:

  • To review recent findings on aging-related changes in the immune response of European songbirds.
  • To investigate immunosenescence in wild barn swallows and collared flycatchers.
  • To explore the link between immunosenescence, fitness, and the evolution of aging.

Main Methods:

  • Challenging the humoral immune response of free-ranging adult birds during the breeding season.
  • Administering antigens (Newcastle disease virus and sheep red blood cells) to assess antibody production.
  • Monitoring antibody titers, offspring body mass, and survival rates in relation to age.

Main Results:

  • Older barn swallows, especially breeding females, exhibited lower antibody responses to Newcastle disease virus.
  • Older female collared flycatchers produced lower antibody titers to sheep red blood cells compared to younger breeders.
  • Offspring of older female flycatchers had lower average body masses.

Conclusions:

  • Age-related declines in immune function (immunosenescence) are evident in wild songbirds.
  • These immune changes may have implications for reproductive success and offspring health.
  • Studies in wild populations can bridge laboratory research with understanding the evolution of aging.

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