THE EFFECTS OF GENE FLOW ON REINFORCEMENT

THE EFFECTS OF GENE FLOW ON REINFORCEMENT
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基因流对强化的影响

DOI:
10.1111/j.1558-5646.1997.tb05100.x
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发表时间:
1997
期刊:
影响因子:
3.3
通讯作者:
M. Kirkpatrick
M. Kirkpatrick
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
M. Servedio;M. Kirkpatrick

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我们通过比较单向迁移与对称迁移的种群对,探讨了种群之间基因流动模式的差异可能影响强化进化的可能性。对称迁移的情况由两岛模型建模,其中两个人口每一代交换相等比例的移民。单向迁移由大陆-岛屿模型建模,其中迁移是在一个方向上从具有固定基因型的大型大陆人群到基因型频率可以变化的岛屿人群。杂交不活力被认为是由背景基因座之间的上位性相互作用引起的。我们研究了一个引入的偏好等位基因的传播,以前不喜欢的男性特征的人口之一。计算机模拟表明,在弱引入偏好的情况下,在对称迁移模型中,在广泛的参数值范围内,强化是可能的,但在单向迁移模型中不会发生。单向迁移的强化只有在非常强的引入偏好和非常强的对杂种的选择下才能发生。我们的研究结果表明,如果在生殖隔离完全发展之前发生二次接触,则基本上经历单向迁移的外围隔离的物种形成可能难以完成。
We explore the possibility that differences in the pattern of gene flow between populations may affect the evolution of reinforcement by comparing pairs of populations undergoing one‐way migration versus symmetric migration. The case of symmetric migration is modeled by a two‐island model, where the two populations exchange equal proportions of migrants each generation. One‐way migration is modeled by a continent‐island model, where migration is in one direction from a large continental population with a fixed genotype to an island population whose genotype frequencies can vary. Hybrid inviability is assumed to be caused by epistatic interactions between background loci. We examine the spread of an introduced preference allele for a previously unpreferred male trait that characterizes one of the populations. Computer simulations indicate that with a weak introduced preference, reinforcement is possible under a wide range of parameter values in a symmetric migration model but cannot occur in a one‐way migration model. Reinforcement with one‐way migration can occur only with a very strong introduced preference and very strong selection against hybrids. Our results suggest that the speciation of a peripheral isolate, which undergoes essentially one‐way migration, may be difficult to complete if secondary contact occurs before reproductive isolation is fully developed.
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发表时间: 1996
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