Reproductive biology of captive male cottontop tamarin monkeys as a function of social environment
Reproductive biology of captive male cottontop tamarin monkeys as a function of social environment
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DOI：
10.1006/anbe.2000.1587
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发表时间：
2001-01-01
期刊：
影响因子：
2.5
通讯作者：
Snowdon, CT
中科院分区：
文献类型：
--
作者：
Ginther, AJ;Ziegler, TE;Snowdon, CT
棉顶绢毛猴（学名：Saguinus oedipus oedipus）是一种合作繁殖的猴子，成熟的雄性和雌性后代作为助手帮助抚养年幼的兄弟姐妹。一般来说，每个社会群体只有一个女性繁殖;繁殖限制是通过低水平和非周期性的生殖激素介导的。我们调查了（1）青春期后雄性后代的生殖活动，（2）对雄性后代的攻击和皮质醇介导的应激反应是否会限制纳塔尔组雄性后代的繁殖。我们研究了性行为，嗅觉沟通和尿激素水平（睾酮，双氢睾酮，促黄体生成激素，皮质醇）的主题男性，而我们操纵他们的社会环境，从住房在纳塔尔组配对与一个新的女性，并在生产自己的后代。纳塔尔组的男性受试者的安装和勃起率与与新女性配对时一样高。然而，大多数坐骑在纳塔尔组直接对其他男性，并没有发生完整的交配序列与出生组女性。社会环境对繁殖期雌性的嗅觉调查无显著影响。虽然激素水平显着增加后，受试者从纳塔尔组，海拔是短暂的;激素水平的受试者在他们的纳塔尔组并没有不同的水平时，成功地生产自己的后代相同的男性。雄性后代在纳塔尔组中比与新的雌性配对时接受更多的接触攻击。然而，大部分的侵略是从兄弟姐妹，而不是育种对，皮质醇的水平并不符合侵略的水平。因此，在这两个行为和内分泌水平，成熟的男性后代在圈养纳塔尔组有潜在的生育能力，但与出生组女性的性活动似乎是行为上的限制，而不是针对组男性。在野生棉顶绢毛猴群体中，这种繁殖潜力可能允许雄性助手灵活地应对繁殖机会。(C)2001年，动物行为研究协会。
The cottontop tamarin, Saguinus oedipus oedipus, is a cooperatively breeding monkey in which mature male and female offspring serve as helpers to assist in rearing younger siblings. Generally, only one female per social group reproduces; breeding restriction is mediated in postpubertal female offspring through low and acyclic levels of reproductive hormones. We investigated (1) reproductive activity of postpubertal male offspring, and (2) whether aggression towards male offspring and a cortisol-mediated stress response might restrict breeding of male offspring in the natal group. We examined sexual behaviour, olfactory communication and urinary hormone levels (testosterone, dihydrotestosterone, luteinizing hormone, cortisol) of the subject males while we manipulated their social environment from housing in natal groups to pairing with a novel female, and after the production of their own offspring. Mounting and erection rates of the male subjects were as high in the natal group as when paired with a novel female. However, most mounts in the natal group were directed towards other males, and complete copulation sequences did not occur with natal-group females. Social environment had no significant effect on olfactory investigation of breeding females. Although hormone levels increased significantly after the subjects were removed from the natal group, the elevation was transient; the hormone levels of subjects in their natal groups did not differ from the levels shown by the same males when successfully producing their own offspring. Male offspring received more contact aggression in the natal group than when paired with the novel female. However, most of the aggression was received from siblings rather than the breeding pair, and levels of cortisol did not correspond with levels of aggression. Thus, at both a behavioural and endocrine level, mature male offspring in captive natal groups were potentially fertile, but sexual activity with natal-group females appeared to be behaviourally restricted and directed instead towards group males. In wild cottontop tamarin groups, this reproductive potential may allow male helpers flexibility to respond to breeding opportunities. (C) 2001 The Association for the Study of Animal Behaviour.