Immune response of nestling warblers varies with extra-pair paternity and temperature

Autor:	Marc C. Pedersen, Betsy Abroe, Peter O. Dunn, Julia C. Garvin, Linda A. Whittingham
Rok vydání:	2006
Předmět:	Genetics education.field_of_study Offspring Population Zoology Biology Environmental variation Adaptive functioning Immune system Air temperature Sexual selection Mating education Ecology Evolution Behavior and Systematics
Zdroj:	Molecular Ecology. 15:3833-3840
ISSN:	1365-294X 0962-1083
DOI:	10.1111/j.1365-294x.2006.03042.x
Popis:	Extra-pair mating is widespread in birds, but its adaptive function remains unclear. It is often suggested that females obtain superior genes for their offspring as a consequence of extra-pair mating, but the evidence is limited. In this study, we examined the hypothesis that extra-pair mating provides females with offspring that have superior immune responses. We found that the T-cell-mediated immune response of extra-pair young was stronger than that of within-pair young in common yellowthroats (Geothlypis trichas). This paternity effect occurred when we compared all nestlings in the population, as well as in comparisons of both paternal and maternal half-siblings. Paternal half-siblings had a stronger immune response when they were produced with extra-pair females than with the male's social mate, which suggests that the greater immune response of extra-pair young was caused by nonadditive (compatible) genetic effects. However, these patterns were only significant in the colder of 2 years. Immune response was related positively to air temperature and nestlings had a stronger immune response in the warmer year. We suggest that such environmental variation could obscure the genetic benefits of extra-pair mating.
Databáze:	OpenAIRE
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