男性介导的早熟不太可能通过适应性进化演变而来

IF 2.3 2区 生物学 Q2 BEHAVIORAL SCIENCES
Brian A. Lerch , Matthew N. Zipple , Laurence R. Gesquiere , Evan T. Sloan , Jacinta C. Beehner , Susan C. Alberts
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引用次数: 0

摘要

凡登伯格效应(Vandenbergh effect),或称雄性介导的成熟,是指雌性在接触到新的雄性后达到性成熟。雄性介导的成熟在哺乳动物中都有发现,包括在狮尾狒(Theropithecus gelada)中,这可能是在新雄性迁入后对杀婴行为的一种适应性反击策略;在雄性迁入后成熟可使雌性在下一个杀婴的雄性迁入前断奶其第一个后代的机会最大化("最佳时机假说")。另一种非适应性的 "布鲁斯效应副产品假说 "则认为,由雄性动物(也可能是其他哺乳动物)促成的明胶蛙的成熟是由怀孕雌性动物产生自发性流产(布鲁斯效应)的相同生理变化引发的。我们利用理论和观察数据检验了这两个假设。我们的研究表明,在狒狒(Papio cynocephalus × Papio anubis)这种没有布鲁斯效应的灵长类动物身上,既没有雄性介导的成熟,也没有与之相关的激素变化。一个基于个体的模型表明,雄性介导的成熟在狮尾狒和狒狒中都不应该通过适应性进化来实现。最后,我们推导出了以雄性为媒介的成熟的选择系数,并表明该系数可能非常小,因为以雄性为媒介的成熟只能产生微不足道的潜在益处,除非该系统经过了极其精细的调整。我们的结论是,明胶中以雄性为媒介的成熟是布鲁斯效应的副产品,更广泛地说,范登堡效应可能是非适应性的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Male-mediated early maturation unlikely to evolve via adaptive evolution

The Vandenbergh effect, or male-mediated maturation, occurs when females reach sexual maturation upon exposure to a novel male. Male-mediated maturation is found across mammals, including in geladas, Theropithecus gelada, where it may be an adaptive counterstrategy to infanticide that follows the immigration of a new male; maturing after male immigration maximizes a female's chances of weaning her first offspring before the next infanticidal male immigrates (the ‘optimal timing hypothesis’). Alternatively, the nonadaptive ‘Bruce effect by-product hypothesis’ posits that male-mediated maturation in geladas (and possibly other mammals) is triggered by the same physiological changes that, in pregnant females, produce spontaneous abortion (the Bruce effect). We test both hypotheses using theory and observational data. We show that neither male-mediated maturation nor its associated hormonal changes occur in baboons (Papio cynocephalus × Papio anubis), a primate without the Bruce effect. An individual-based model suggests that male-mediated maturation should not evolve via adaptive evolution in either geladas or baboons. Finally, we derive the selection coefficient for male-mediated maturation and show it is likely to be very small because male-mediated maturation yields only marginal potential benefits unless the system is extremely fine-tuned. We conclude that male-mediated maturation in geladas is a by-product of the Bruce effect and more broadly that the Vandenbergh effect may be nonadaptive.

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来源期刊
Animal Behaviour
Animal Behaviour 生物-动物学
CiteScore
4.60
自引率
8.00%
发文量
236
审稿时长
10.2 weeks
期刊介绍: Growing interest in behavioural biology and the international reputation of Animal Behaviour prompted an expansion to monthly publication in 1989. Animal Behaviour continues to be the journal of choice for biologists, ethologists, psychologists, physiologists, and veterinarians with an interest in the subject.
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