作者: Mark F. Haussmann , David W. Winkler , Charles E. Huntington , David Vleck , Carrie E. Sanneman
DOI: 10.1007/S00442-005-0123-3
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摘要: The phytohaemagglutinin (PHA) skin test response, used to assess cell-mediated immunity, is known vary with many social and energetic factors, but the effects of age have received little attention. We found that PHA response immature birds was lower than those youngest breeding adults were decreased in adults. Whenever possible, should be included as a covariate when immunocompetence ecological immunology. rate decline differed between species inversely correlated survival. decrease averaged 57% over an average 80% maximum life span, absolute varied lifespan such short-lived showed greater loss per year long-lived species. This link declining immune function survival may reflect differences resource partitioning species, suggests selection act on investment influence span.