Abstract Male signals may express the capacity to sustain environmental challenges. In some migratory birds like Pied Flycatcher Ficedula hypoleuca , plumage ornaments are molted in winter quarters shortly before spring migration while most feathers replaced after breeding season areas. The concentration of corticosterone (CORTf) relate baseline CORT levels at time molt which could be expressed...

Songbird populations are in decline all over the world, and our understanding of causal mechanisms remains surprisingly limited. It is important to identify extent individual variations migratory behaviour better understand species' ability respond environmental change. We describe annual British breeding European Pied Flycatchers Ficedula hypoleuca by using light-recording geolocators. During ...

Animal signals are hypothesized to be costly in order to honestly reflect individual quality. Offspring solicitation signals given by nestling birds are thought to have evolved to advertise either need or individual quality. We tested the potential role of testosterone (T) in controlling the intensity of these signals by measuring begging behaviour as: (i) duration of the begging display and (i...

—We report association between female blood parasite prevalence (percentage of infected birds) just after egg laying and reproductive success in two successive breeding seasons, in a breeding population of Pied Flycatcher Ficedula hypoleuca in central Spain. Females infected with Trypanosoma spp. had a higher probability of deserting their clutches during the incubation period than noninfected ...