Experimental test of a trade-off between moult and immune response in house sparrows Passer domesticus

A trade-off between immune system and moulting is predicted in birds, given that both functions compete for resources. However, it is unclear whether such a trade-off exists during post-breeding moult. This study tests such a trade-off in the house sparrow (Passer domesticus). Males injected with an...

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Bibliographic Details
Published in:Journal of evolutionary biology 2010-10, Vol.23 (10), p.2229-2237
Main Author: MORENO-RUEDA, G
Format: Article
Language:English
Subjects:
Animals
Birds
Body mass
Hemagglutinins
Immune response
Immune system
Immunity
Lipopolysaccharides
Male
Molting
Molting - immunology
moult
Parasite resistance
Passer domesticus
Pathogens
Phytohemagglutinins
Plumage
plumage condition
Sparrows - immunology
trade-offs
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Summary:A trade-off between immune system and moulting is predicted in birds, given that both functions compete for resources. However, it is unclear whether such a trade-off exists during post-breeding moult. This study tests such a trade-off in the house sparrow (Passer domesticus). Males injected with an antigen (lipopolysaccharide) significantly moulted slower than sham-injected males. Moreover, males whose seventh primaries were plucked to simulate moult showed smaller immune response to phytohaemagglutinin than control males, in which seventh primaries were clipped. A trade-off between moult speed and body mass was also found. The results show a clear trade-off between moult and immune response in the house sparrow: immune response negatively affected moult and moult negatively affected immune response. These findings suggest that only individuals in good condition may have an efficient moult and simultaneously respond effectively in terms of immunity to pathogens, which could explain how plumage traits honestly indicate parasite resistance in birds.
ISSN:1010-061X
1420-9101
DOI:10.1111/j.1420-9101.2010.02090.x