Oecologia

, Volume 145, Issue 2, pp 326–333

Cross-fostering reveals an effect of spleen size and nest temperatures on immune responses in nestling European starlings

Behavioral ecology

DOI: 10.1007/s00442-005-0120-6

Cite this article as:
Ardia, D.R. Oecologia (2005) 145: 326. doi:10.1007/s00442-005-0120-6
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Abstract

Immunocompetence may be a good measure of offspring quality, however, factors affecting variation in immune responses are not clear. Research suggests that immune function can vary due to differences in genetics, development conditions and individual quality. Here, I examined factors affecting variation in immune response among nestling European starlings through a split-nest cross-fostering brood manipulation that included two important covariates: spleen size and nest temperatures. Immunocompetence was assessed via a cell-mediated immune response to phytohaemagglutinin (PHA). This paper provides the first direct evidence that individuals with large spleens also mount strong immune responses. Exposure to PHA did not cause splenomegaly, as there was no difference in spleen size between control birds and those injected with PHA. Offspring immune function was affected by common origin and by rearing environment, though rearing environment appeared to exert its influence only through nest temperatures. A comparison of the immune performance of siblings reared in their home nest versus those reared in other nests revealed a strong effect of maternal quality. As the difference in natal clutch size increased, the magnitude of the difference in immune performance between home-reared nestlings versus out-reared nestlings increased. Overall, nestling immune function appears to be determined by the combination of genetic, maternal and environmental effects.

Keywords

Cell-mediated immune function Cross-fostering Offspring quality Rearing environment Sturnus vulgaris 

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Ecology and Evolutionary BiologyCornell UniversityIthacaUSA
  2. 2.Program in Organismic and Evolutionary Biology, Morrill Science CenterUniversity of MassachusettsAmherstUSA

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