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- W2794393407 abstract "Abstract Migratory birds move through multiple habitats and encounter a diverse suite of parasites. This raises concern over migrants’ role in transporting infectious disease between breeding and wintering grounds, and along migratory flyways. Trade‐offs between flight and immune defenses could interfere with infected individuals’ migratory timing and success, potentially affecting infection dynamics. However, experimental evidence that parasitic infection affects migratory preparation or timing remains scant. We hypothesized that birds encountering hematozoan parasites shortly before migration incur physical costs (reduced body condition) and behavioral costs (delayed migration), due to the infection itself and/or to the demands of mounting an immune response. We experimentally inoculated song sparrows ( Melospiza melodia ) with Plasmodium shortly before fall migration. We monitored infection and body composition for 2 weeks after inoculation, and used radiotelemetry to track timing of migratory departure for another 7 weeks after release. Inoculated individuals that resisted infection had lower lean mass 12 days post exposure, relative to controls and infected individuals. This suggests trade‐offs between body composition and immune defenses that might reduce migration success of resistant individuals. Despite group differences in body composition prior to release, we did not detect significant differences in timing of migration departure several weeks later. Thus, malarial infection did not appear to incur detectable costs to body composition or to migratory timing, at least when exposure occurs several weeks before migration. This study is novel considering not only the costs of infection, but also the costs of resisting infection, in an experimental context." @default.
- W2794393407 created "2018-03-29" @default.
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- W2794393407 date "2018-01-01" @default.
- W2794393407 modified "2023-10-15" @default.
- W2794393407 title "Exposing migratory sparrows to <i>Plasmodium</i> suggests costs of resistance, not necessarily of infection itself" @default.
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- W2794393407 doi "https://doi.org/10.1002/jez.2151" @default.
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