SOCIOSEXUAL DEVELOPMENT OF MALE COTTON TOP TAMARINS

目的了解人类社会性发育的机制， 雄性绢毛猴来补充我们对雌性绢毛猴的广泛了解 发育结果使用尿激素测量和行为 观察我们已经研究了相同的男性在家庭群体，当 在他们成为父亲之后， 家庭组中的男性 当与一个新的伴侣配对时， 交配，但下降到家庭的水平时，这些男性成为父亲。 家庭组中的男性表现出较高的勃起率和安装率，但 将性行为指向兄弟和父亲，而不是 对女性来说。 男性受到其他群体的高度攻击 成员，但主要来自兄弟姐妹而不是成年人。 额外 研究已经验证了使用非侵入性测量 阴囊宽度，可用于监测激素的发展。 我们 同时纵向测量阴囊变化， 生殖激素在发育过程中的变化。 我们有 完成了一项关于男性荷尔蒙和社会性的纵向研究， 发展，并比较社会互动的性质， 长辈们和父亲不是兄弟。 讨论我们发现男性有 生殖激素和性激素的发育都有很大的不同， 女性的行为。 我们对高水平的同性恋感到惊讶， 家庭群体中的行为。 未来的方向要了解的作用 下属性活动和荷尔蒙功能水平高 棉顶绢毛猴的成年雄性。 资助NIMH 35，215，MH 00177

OBJECTIVE To understand mechanisms of sociosexual development in male tamarins to complement our extensive knowledge of female tamarin development RESULTS Using urinary hormonal measurements and behavioral observations we have studied the same males in family groups, when paired and after they became fathers. Males in family groups had high levels of reproductive hormones which rose when paired with a new mate, but fell to family levels when these males became fathers. Males in family groups showed high rates of erection and mounting, but directed this sexual activity toward brothers and fathers rather than to females. Males received high levels of aggression from other group members, but mainly from siblings rather than adults. Additional studies have validated the use of a non-invasive measurement of scrotal width which can be used to monitor hormonal development. We have simultaneous longitudinal measurements of scrotal change and changes in reproductive hormones through development. We have completed a longitudinal study of male hormonal and sociosexual development and are comparing the nature of social interactions of eldes t brothers with their fathers. DISCUSSION We find males have very different development of both reproductive hormones and sexual behavior from females. We were surprised by high levels of homosexual behavior in family groups. FUTURE DIRECTIONS To understand role of high levels of sexual activity and hormonal function in subordinate adult males in cotton-top tamarins. FUNDING NIMH 35,215, MH 00177