title: Seasonal changes of sexual and territorial behaviour and plasma testosterone levels in male lesser sheathbills (Chionis minor).
abstract: Lesser Sheathbills Chionis minor (Aves: Charadriiformes) have a brief annual breeding season but under certain circumstances territoriality persists outside the breeding season. Seasonal increases in plasma testosterone levels in free-living adult males coincided with increases in the mass of tests, the seasonal peak in mutual pair displays and the occurrence of nest-building and copulation. Territorial aggression outsids the breeding season was not dependent on high testosterone levels.
mesh_terms: D000818:Animals; D001717:Birds / Q000097:blood / Q000502:physiology*; D008297:Male; D012621:Seasons; D012725:Sexual Behavior; D012919:Social Behavior; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone