SOCIOSEXUAL DEVELOPMENT OF MALE COTTON TOP TAMARINS

目的了解青海省青少年社会性发育机制。 雄性罗望子补充我们对雌性罗望子的广泛知识 用尿液激素测量和行为学检测发育结果 观察到，我们在家庭群体中研究了相同的男性，当 配对后，他们成为了父亲。家庭成员中的男性 与新的配对时生殖激素水平上升 配偶，但当这些雄性成为父亲时，下降到家庭层面。 家庭群体中的男性表现出很高的勃起和勃起能力，但 把这种性行为指向兄弟和父亲，而不是 对女性来说。男性受到来自其他群体的高水平攻击 成员，但主要来自兄弟姐妹，而不是成年人。其他内容 研究证实了使用一种非侵入性测量 阴囊宽度，可以用来监测荷尔蒙的发育。我们 同时对阴囊变化和阴囊变化进行纵向测量 生殖激素在发育过程中的变化。我们有 完成了对男性荷尔蒙和社会性的纵向研究 发展和正在比较的社会互动的性质 长兄们和他们的父亲在一起。讨论我们发现男性有 生殖荷尔蒙和性激素的发育非常不同 雌性的行为。我们对高水平的同性恋感到惊讶 在家庭群体中的行为。未来理解角色的方向 下属的性行为和激素功能水平较高 穿着棉质上衣的成年雄性罗望子。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