Pre-hatching maternal effects and the tasty chick hypothesis

Publication Type:Journal Article
Year of Publication:2008
Authors:A. Roulin, Gasparini, J., Froissart, L.
Journal:Evolutionary Ecology Research
Date Published:March
Type of Article:Article
ISBN Number:1522-0613
Accession Number:ZOOREC:ZOOR14410057877
Keywords:Carnidae, Carnus hemapterus, on Tyto alba

Question: Are maternal effects (i.e. maternal transfer of immune components to their offspring via the placenta or the egg) specifically directed to the offspring on which ectoparasites predictably aggregate? Organisms: The barn owl (Tyto alba) because late-hatched offspring are the main target of the ectoparasitic fly Carnus hemapterus. Hypothesis: Pre-hatching maternal effects enhance parasite resistance of late- compared with early-hatched nestlings. Search method: To disentangle the effect of natal from rearing ranks on parasite intensity, we exchanged hatchlings between nests to allocate early- and late-hatched hatchlings randomly in the within-brood age hierarchy. Result: After controlling for rearing ranks, cross-fostered late-hatched nestlings were less parasitized but lighter than cross-fostered early-hatched nestlings. Conclusion: Pre-hatching maternal effects increase parasite resistance of late-hatched offspring at a growth cost.

URL:<Go to ISI>://ZOOREC:ZOOR14410057877
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