Silverin B, Viebke P A, Westin J
Horm Behav. 1984 Dec;18(4):367-79. doi: 10.1016/0018-506x(84)90023-0.
Plasma levels of LH, DHT, testosterone, and corticosterone were measured for all members in free-living winter flocks of willow tits, Parus montanus. Hormonal data were related to (1) flock size and (2) age/sex differences. The winter flock defends a large winter territory and shows a well-established social hierarchy in which adults consistently dominate first-year birds. One winter group normally consists of four individuals, two adults and two juveniles. In flocks containing four or five members juvenile willow tits had significantly higher corticosterone values than adults. In small-sized groups, containing three members, all individuals had high plasma levels of corticosterone. No other effects of flock size was found. When data were treated on an age/sex basis, i.e., flock size was not considered, juvenile females were found to have significantly higher plasma levels of testosterone than adult birds, and also significantly higher levels of DHT than juvenile males and adult females. Also, juvenile willow tits had significantly higher plasma levels of corticosterone than adult birds.
对自由生活的冬季柳莺（Parus montanus）群体中的所有个体测量了促黄体生成素（LH）、双氢睾酮（DHT）、睾酮和皮质酮的血浆水平。激素数据与（1）群体大小和（2）年龄/性别差异相关。冬季群体保卫着大片冬季领地，并呈现出既定的社会等级制度，其中成年个体始终支配着当年幼鸟。一个冬季群体通常由四个个体组成，两个成年个体和两个幼鸟。在包含四个或五个成员的群体中，幼年柳莺的皮质酮值显著高于成年个体。在包含三个成员的小群体中，所有个体的血浆皮质酮水平都很高。未发现群体大小的其他影响。当按年龄/性别处理数据时，即不考虑群体大小，发现幼年雌性的睾酮血浆水平显著高于成年鸟类，且双氢睾酮水平也显著高于幼年雄性和成年雌性。此外，幼年柳莺的皮质酮血浆水平显著高于成年鸟类。
