Schlinger B A
Horm Behav. 1987 Jun;21(2):203-10. doi: 10.1016/0018-506x(87)90045-6.
Captive white-throated sparrows (Zonotrichia albicollis), held under a natural photoperiod, were pair tested to evaluate dominance and aggressiveness in relation to plasma androgen levels and plumage morphology. Androgen levels were determined in November, 1 week before behavioral testing began; in January, at the conclusion of behavioral testing; and again in March. November plasma androgen levels of captive birds did not differ from those of a group of feral birds and were greater than androgen levels in January and March. Androgen levels of male and female white-striped and tan-striped birds did not differ for any collection date. November plasma A levels were significantly positively correlated with the display of aggressive behaviors by test birds and were inversely correlated, though not significantly, with hierarchy position. Plasma androgen levels determined in January and March were not related to aggressiveness or dominance. These data suggest that circulating androgens and morphological characters may act synergistically, at the onset of flock formation, to influence avian winter dominance hierarchies.
将圈养的白喉带鹀（Zonotrichia albicollis）置于自然光照周期下，对其进行配对测试，以评估与血浆雄激素水平和羽毛形态相关的优势地位和攻击性。在11月（行为测试开始前1周）、1月（行为测试结束时）和3月分别测定雄激素水平。圈养鸟类11月的血浆雄激素水平与一组野生鸟类的水平没有差异，且高于1月和3月的雄激素水平。在任何采集日期，白色条纹和褐色条纹的雄性和雌性鸟类的雄激素水平都没有差异。11月血浆雄激素水平与受试鸟类攻击行为的表现显著正相关，与等级地位呈负相关（虽不显著）。1月和3月测定的血浆雄激素水平与攻击性或优势地位无关。这些数据表明，在鸟群形成初期，循环雄激素和形态特征可能协同作用，影响鸟类冬季优势等级。
