Hernández-López Leonor, Cerda-Molina Ana L, Díaz-Díaz Guillermo, Chavira-Bolaños Roberto, Mondragón-Ceballos Ricardo
Departamento de Etología, Instituto Nacional de Psiquiatría, Col. San Lorenzo, Huipulco, Tlalpan, México, D.F., México.
J Med Primatol. 2012 Apr;41(2):115-21. doi: 10.1111/j.1600-0684.2011.00528.x. Epub 2012 Jan 20.
It is unknown whether male black-handed spider monkeys (Ateles geoffroyi) undergo a reproductive decline as they age. The purpose of this work was investigating whether serum testosterone and semen quality decrease with age in these primates as occur in other species.
In this study, we assessed age variations in the concentration of serum testosterone, sperm counts, and motility in nine males. We took serum blood samples and semen samples by electroejaculation of anesthetized males throughout the fertile season.
We found that testosterone levels and total sperm concentration, motile, progressive, fast linearly moving, medium linearly moving, slow linearly moving and immotile sperm significantly decreased with age.
Our results show that a reproductive decline occurs in male spider monkeys because of a decrease in sperm counts. These results are similar to those of rhesus monkeys and men, despite the phylogenetic distance between New and Old World primates.
尚不清楚雄性黑掌蜘蛛猴（Ateles geoffroyi）是否会随着年龄增长而出现生殖能力下降的情况。本研究的目的是调查这些灵长类动物的血清睾酮水平和精液质量是否会像其他物种那样随着年龄增长而降低。
在本研究中，我们评估了9只雄性黑掌蜘蛛猴血清睾酮浓度、精子数量和活力的年龄差异。在整个繁殖季节，我们通过对麻醉后的雄性蜘蛛猴进行电刺激射精来采集血清样本和精液样本。
我们发现，睾酮水平以及总精子浓度、活动精子、进行性运动精子、快速直线运动精子、中等直线运动精子、缓慢直线运动精子和不活动精子的数量均随年龄显著下降。
我们的结果表明，雄性蜘蛛猴由于精子数量减少而出现生殖能力下降。尽管新大陆和旧大陆灵长类动物在系统发育上存在距离，但这些结果与恒河猴和人类的结果相似。
