Male-Mediated Maturation in Wild Geladas
Male-Mediated Maturation in Wild Geladas
复制标题
野生狮羚的雄性介导的成熟
DOI：
10.1016/j.cub.2020.10.003
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发表时间：
2021
期刊：
影响因子：
9.2
通讯作者：
Beehner, Jacinta C.
中科院分区：
文献类型：
--
作者：
Lu, Amy;Feder, Jacob A.;Snyder-Mackler, Noah;Bergman, Thore J.;Beehner, Jacinta C.
野生哺乳动物雌性成熟的时间往往受到与食物获取有关的生态变量的限制。然而，雌性哺乳动物的成熟时间也会对社会变量做出反应。具体来说，新的男性的到来可以加速成熟，而相关的男性的存在可以抑制it.Despite研究超过二十几个哺乳动物类群在圈养，男性介导的成熟的证据还没有系统地证明在任何野生种群。在这里，我们报告的第一个证据男性介导的成熟在野生灵长类动物，狒狒（Theropithecus gelada）。在一个新的繁殖雄性进入群体（雄性接管）后，年轻的雌性成熟的可能性增加了三倍。然后，我们更详细地研究了这些与接管相关的成熟：有些比预期的要早（假定的“范登堡效应”或雄性加速成熟），有些处于平均雌性狒狒的预期年龄，有些比预期的要晚（假定的“近亲繁殖避免延迟”或父亲诱导的生殖抑制）。对粪便中雌激素的检测显示，雄性的接管会导致所有年龄段的未成熟雌性体内雌激素的激增，即使是那些尚未成熟的雌性。这些是第一个数据表明，特定的男性与野生灵长类动物成熟的开始，并提供了一个可能的机制，这种变化。这些结果表明，所有男性介导的成熟（无论是加速，按时或延迟）可能是由类似的神经内分泌过程。
The timing of female maturation in wild mammals is often constrained by ecological variables that relate to food acquisition. However, maturational timing in female mammals can also respond to social variables. Specifically, the arrival of novel males can accelerate maturation while the presence of related males can inhibit it. Despite studies on more than two dozen mammalian taxa in captivity, evidence for male-mediated maturation has not been systematically demonstrated in any wild population. Here, we report the first evidence of male-mediated maturation in a wild primate, the gelada (Theropithecus gelada). After the arrival of a new breeding male in the group (a male takeover), young females were three times more likely to mature. We then examined these takeover-associated maturations in more detail: some were earlier than expected (a presumptive "Vandenbergh effect," or male-accelerated maturation), some were at the expected age for the average female gelada, and some were later than expected (a presumptive "inbreeding avoidance delay," or father-induced reproductive suppression). An examination of fecal estrogens, which rise just before visible signs of maturation in this species, revealed that male takeovers induced a surge in estrogens for immature females of all ages—even females that did not mature. These are the first data to demonstrate that specific males are associated with the onset of maturation in a wild primate and to provide a possible mechanism for this change. These results suggest that all male-mediated maturation (whether accelerated, on-time, or delayed) may be governed by similar neuroendocrine processes.