Tobler Michael, Schlupp Ingo
Zoologisches Institut, Universität Zürich, Winterthurerstr 190, Zürich, Switzerland.
Biol Lett. 2005 Jun 22;1(2):166-8. doi: 10.1098/rsbl.2005.0305.
The maintenance of sexual reproduction in the face of its supposed costs is a major paradox in evolutionary biology. The Red Queen hypothesis, which states that sex is an adaptation to fast-evolving parasites, is currently one of the most recognized explanations for the ubiquity of sex and predicts that asexual lineages should suffer from a higher parasite load if they coexist with closely related sexuals. We tested this prediction using four populations of the sexual fish species Poecilia latipinna and its asexual relative Poecilia formosa. Contrary to expectation, no differences in parasite load could be detected between the two species.
在存在假定成本的情况下维持有性生殖,是进化生物学中的一个主要悖论。红皇后假说指出,有性生殖是对快速进化的寄生虫的一种适应,目前是对有性生殖普遍性最广为人知的解释之一,并预测如果无性谱系与亲缘关系密切的有性谱系共存,它们应承受更高的寄生虫负荷。我们使用有性鱼类物种帆鳉及其无性近亲墨西哥帆鳉的四个种群来检验这一预测。与预期相反,未检测到这两个物种在寄生虫负荷上存在差异。