Clone mixtures and a pacemaker: new facets of Red-Queen theory and ecology
Clone mixtures and a pacemaker: new facets of Red-Queen theory and ecology
复制标题
克隆混合物和起搏器：红皇后理论和生态学的新方面
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Francisco Úbeda
中科院分区：
文献类型：
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作者：
Akira Sasaki;William D. Hamilton;Francisco Úbeda
宿主-寄生虫拮抗相互作用已被提出作为促进遗传多态性和有利于性对asex的潜在代理，尽管其在繁殖中的双重成本。然而，宿主-寄生虫基因对基因的动态经常产生不稳定的循环，往往会破坏遗传多样性。在这里，我们研究这种多样性破坏主机和寄生虫，这是耦合通过本地或全球性的迁移，或两者兼而有之，在集合种群结构之间的demes的共同进化动力学。我们发现，在岛屿模型中的全球移民，奇特的相位岛屿自发地出现在集群的岛屿收敛到一个全球同步。这种由“起搏器岛”引起的突变有助于恢复遗传变异。随着局部迁移比例的增加，类人猿的斑点被转换成螺旋和目标模式的轨迹或焦点，其旋转臂覆盖了大部分的类人猿。一个多位点的模拟模型再现了相同的倾向，对无性繁殖，和条件出现的优势无性克隆的有性对应物时，保持足够的遗传多样性，通过集合种群存储迁移作为一种廉价的替代性。
Host–parasite antagonistic interaction has been proposed as a potential agent to promote genetic polymorphism and to favour sex against asex, despite its twofold cost in reproduction. However, the host–parasite gene–for–gene dynamics often produce unstable cycles that tend to destroy genetic diversity. Here, we examine such diversity destroying coevolutionary dynamics of host and parasite, which is coupled through local or global migration, or both, between demes in a metapopulation structure. We show that, with global migration in the island model, peculiar out–of–phase islands spontaneously arise in the cluster of islands converging to a global synchrony. Such asynchrony induced by the‘pacemaker island’ serves to restore genetic variation. With increasing fraction of local migration, spots of asynchrony are converted into loci or foci of spiral and target patterns, whose rotating arms then cover the majority of demes. A multi–locus analogue of the model reproduces the same tendency toward asynchrony, and the condition arises for an advantage of asexual clones over their sexual counterpart when enough genetic diversity is maintained through metapopulation storage—migration serves as a cheap alternative to sex.