Senescencia, parasitismo, inmunidad y éxito reproductor en el Avión Común (Delichon urbica Linneo 1758)

Breeding success of birds is affected by blood parasites infections, by influencing clutch size, or by producing an energetic cost in inmune response. Infection increases as a consecuence of inmunological deterioration with age. Yolk androgen allocation depends on female body condition.