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A rare study from the wintering grounds provides insight into the costs of malaria infection for migratory birds
- Source :
- Journal of Avian Biology. 47:575-582
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- Malaria parasites can have strong effects on the population dynamics and evolution of migratory bird species. In many species, parasite transmission occurs on the wintering grounds, but studies to determine the consequences of infection have taken place during the breeding season, when malaria parasites circulate at chronic levels. We examined the predictors of malarial infections for great reed warblers during the northern winter in Africa, where active parasite transmission is thought to occur and naive individuals experience acute infections. Counter to expectations, we found that winter infection intensities were lower than those encountered on the breeding grounds. One potential explanation is that reduced immune function during breeding allows parasites to persist at higher chronic intensities. We found no relationships between the incidence or intensity of infection on condition (as measured by scaled mass index, plasma metabolites, and feather corticosterone), spring migration departure dates, or home range sizes. We also tested a prediction of the Hamilton–Zuk hypothesis and found that male ornament (song) quality was unrelated to parasitic infection status. Overall, our results provide the first evidence that long-distance migrants captured on their wintering grounds are in the chronic stage of infection, and suggest that winter studies may fare no better than breeding studies at determining the costs of acute malarial infection for great reed warblers.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Home range
Population
Zoology
Biology
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
Avian malaria
Seasonal breeder
medicine
education
Ecology, Evolution, Behavior and Systematics
Chronic stage
education.field_of_study
Ecology
Incidence (epidemiology)
medicine.disease
3. Good health
030104 developmental biology
Feather
visual_art
visual_art.visual_art_medium
Animal Science and Zoology
Malaria
Subjects
Details
- ISSN :
- 1600048X and 09088857
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Journal of Avian Biology
- Accession number :
- edsair.doi...........f646d85298f8e1b4f83298a793750730