Migration distance does not predict blood parasitism in a migratory songbird

Ecology and Evolution
Marjorie C SorensenClaire N Spottiswoode

Abstract

Migration can influence host-parasite dynamics in animals by increasing exposure to parasites, by reducing the energy available for immune defense, or by culling of infected individuals. These mechanisms have been demonstrated in several comparative analyses; however, few studies have investigated whether conspecific variation in migration distance may also be related to infection risk. Here, we ask whether autumn migration distance, inferred from stable hydrogen isotope analysis of summer-grown feathers (δ2Hf) in Europe, correlates with blood parasite prevalence and intensity of infection for willow warblers (Phylloscopus trochilus) wintering in Zambia. We also investigated whether infection was correlated with individual condition (assessed via corticosterone, scaled mass index, and feather quality). We found that 43% of birds were infected with Haemoproteus palloris (lineage WW1). Using generalized linear models, we found no relationship between migration distance and either Haemoproteus infection prevalence or intensity. There was spatial variation in breeding ground origins of infected versus noninfected birds, with infected birds originating from more northern sites than noninfected birds, but this difference translated i...Continue Reading

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Citations

Mar 5, 2021·Biological Reviews of the Cambridge Philosophical Society·Robert Poulin, Daniela de Angeli Dutra
Apr 10, 2021·Emerging Infectious Diseases·Xiang LiHongliang Chai
Aug 12, 2021·International Journal for Parasitology. Parasites and Wildlife·Mizue InumaruAlfonso Marzal

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Methods Mentioned

BETA
PCR
PCRs
PCA
genotyping

Software Mentioned

SpatialPack
NatureServe
R
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raster
maptools
geosphere

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