Non-migratory stonechats show seasonal changes in the hormonal regulation of non-seasonal territorial aggression.

摘要: In many birds and mammals, male territorial aggression is modulated by elevated circulating concentrations of the steroid hormone testosterone (T) during breeding season. However, species are also non-breeding season, when plasma T levels basal. The endocrine control differs considerably between species, previous studies on wintering suggest differences migratory resident species. We investigated modulation season in a population European stonechats (Saxicola torquata rubicola). recorded aggressive response to simulated intrusion spring winter. Then, we compared seasons an experiment which blocked androgenic estrogenic action T. found no difference similarly what stonechats, hormonal treatment decreased behaviors males whereas effects were When responses untreated with those obtained from populations study, that was lower than Our results show and/or its metabolites but not addition, our study supports hypothesis status does modulate intensity behavior.