The hormone corticosterone (CORT) is an important component of a bird's response to environmental stress, but it can also have negative effects. Therefore, birds on migration are hypothesized to have repressed stress responses (migration-modulation hypothesis). In contrast to earlier studies on long-distance migrants, we evaluate this hypothesis in a population containing both migratory and res...

A Corsican population of blue tits (Parus caeruleus) suffers extremely high levels of infestation by two species of blow flies (genus Protocalliphora) that have been suspected to influence the life-history traits of their hosts. By quantifying the abundance of the blow fly larvae infesting each brood of this population during 2 consecutive years, we showed that the distribution of these parasit...

diet of adult pikeperch sander lucioperca, eurasian perch perca fluviatilis, northern pike esox lucius and european catfish silurus glanis as top predators in aquatic ecosystems in serbia was investigated during 2011, in order to understand their relationship to their prey and to investigate their food consumption, feeding and assimilation rate, cannibalism, and habitat segregation. northern pi...