Changes in Plasma Retinol of American Kestrels (Falco sparverius) in Response to Dietary or in Ovo Exposure to Environmentally Relevant Concentrations of a Penta-Brominated Diphenyl Ether Mixture, De-71

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Manfred E. Rau ◽  
David M. Bird

Trichinella pseudospiralis infections induced mild behavioural changes in the American kestrel host (Falco sparverius) within the first 5 days postinoculation, a period that corresponds to the adult phase of the infection. However, more severe effects on mobility were precipitated as the larvae migrated and became established in the musculature. The debilitation persisted for at least 5 weeks postinoculation and involved a reduction in exercising, flying, elevated perching, and preening, and was accompanied by an increase in the frequency of walking and floor perching. Such behavioural effects, attributable to the presence of muscle larvae, may reduce the competitive fitness of infected individuals. The muscle larvae were randomly distributed among various muscle groups.


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