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FACEBOOK:“别碰我”

摘要 : 为了拒绝不良“配偶”,生活距离接近的长尾猴物种逐渐进化出某些特定的面部形态,以阻止多余的接触。研究人员将相关论文发表于近日出版的《自然—通讯》期刊上。

 对于长尾猴属的猴子而言,与其他长尾猴物种交配会出现麻烦。这种交配产生的后代可能会不孕不育,如此一来就进入了进化论的一个死胡同。如果大量来自一个单种群的猴子进行了异种交配,可能会引起种群数量锐减。

  拒绝不良“配偶”让长尾猴面容有差异

 拒绝不良“配偶”让长尾猴面容有差异。图片来源:WILLIAM L. ALLEN

问题是,许多不同的长尾猴物种彼此生活范围很接近,这就提高了出现异种交配的风险。于是,生活距离接近的物种逐渐进化出某些特定的面部形态,以阻止多余的接触。研究人员将相关论文发表于近日出版的《自然—通讯》期刊上。

科学家在18个月里为24种长尾猴物种拍摄了照片(如图所示),并使用面部识别算法确定了主要面部特征,结果显示两个“邻居”物种的面部特征有明显不同——鼻部覆盖着白色皮毛斑块、界限清晰的一字眉,五彩缤纷的耳部绒毛,这些仅是其中的几个例子。

而且,该研究结果结束了另一个假设,该理论认为诸如物种栖息地的光照等环境因子,可能导致了长尾猴的面部多样性。

原文摘要:

Character displacement of Cercopithecini primate visual signals

William L. Allen, Martin Stevens & James P. Higham

Animal visual signals have the potential to act as an isolating barrier to prevent interbreeding of populations through a role in species recognition. Within communities of competing species, species recognition signals are predicted to undergo character displacement, becoming more visually distinctive from each other; however, this pattern has rarely been identified. Using computational face recognition algorithms to model primate face processing, we demonstrate that the face patterns of guenons (tribe: Cercopithecini) have evolved under selection to become more visually distinctive from those of other guenon species with whom they are sympatric. The relationship between the appearances of sympatric species suggests that distinguishing conspecifics from other guenon species has been a major driver of diversification in guenon face appearance. Visual signals that have undergone character displacement may have had an important role in the tribe’s radiation, keeping populations that became geographically separated reproductively isolated on secondary contact.

来源: 中国科学报 浏览次数:30

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