Dissertation Research: Natal Dispersal and Reproductive in the Monogamous Dusky Titi Monkey, Callicebus Moloch

在大多数脊椎动物中，儿子或女儿在繁殖前通常比异性的后代分散到离出生地更远的地方。理论表明，哪种性别会分散取决于交配制度以及雄性和雌性对后代的照顾程度。在一夫多妻制的哺乳动物中，雄性通常很少提供照顾，而且雄性比雌性分散得更远。相比之下，在一夫一妻制的鸟类中，雄性通常提供大量的照顾，雌性比雄性分散得更远。很少有人了解在少数一夫一妻制的哺乳动物中，雄性非常关心后代。通过遗传分析和行为观察，本研究将调查黑山雀猴（一种以父亲照顾为特征的一夫一妻制南美灵长类动物）的出生传播模式。这项研究还将调查成人的生殖行为。尽管是一夫一妻制，雌山雀还是会与其他雄性交配。利用基因技术和行为观察，这项研究将确定这些额外的配对是否会产生后代，并将调查指导雌性繁殖决策的因素，以及它们是否影响雄性行为和成对成人之间的社会动态。这一结果将扩大对影响一夫一妻制灵长类动物家庭群体稳定性的因素的理解。

In most vertebrates, either sons or daughters typically disperse farther from the birthplace than offspring of the other sex before breeding. Theory suggests that which sex disperses depends on the mating system and the degree to which males and females invest care in offspring. In polygynous mammals males usually provide little care, and males disperse farther than females. In contrast, in monogamous birds males often provide substantial care, and females disperse farther than males. There is little understanding of dispersal in the few monogamous mammals in which males care significantly for offspring. Through genetic analyses and behavioral observations, this study will investigate patterns of natal dispersal in the dusky titi monkey, a monogamous South American primate characterized by paternal care. The study will also investigate adult reproductive behavior. Despite pairing monogamously, female titi monkeys mate with males other than their mates. Using genetic techniques and behavioral observations, this study will establish whether these extra pair matings produce offspring and will investigate the factors that guide female reproductive decisions and whether they affect paternal behavior and social dynamics between paired adults. The results will broaden understanding of factors that affect the stability of the family group in monogamous primates.