Durrett R, Buttel L, Harrison R
Department of Mathematics, Cornell University, Ithaca, NY 14853, USA.
Heredity (Edinb). 2000 Jan;84 ( Pt 1):9-19. doi: 10.1046/j.1365-2540.2000.00566.x.
We introduce a spatially explicit model of natural hybrid zones that allows us to consider how patterns of allele frequencies and linkage disequilibria change over time. We examine the influence of hybrid zone origins on patterns of variation at two loci, a locus under selection in a two-patch environment, and a linked neutral locus. We consider several possible starting conditions that represent explicit realizations of two alternative scenarios for hybrid zone origins: primary intergradation and secondary contact. Our results indicate that in some circumstances, differences in hybrid zone origins will result in substantially different patterns of variation that may persist for thousands of generations. Our conclusions are generally similar to those previously derived from partial differential equations, but there are also some important differences.
我们引入了一个自然杂交带的空间明确模型，该模型使我们能够考虑等位基因频率和连锁不平衡模式如何随时间变化。我们研究了杂交带起源对两个位点变异模式的影响，一个是在双斑块环境中受选择的位点，另一个是连锁中性位点。我们考虑了几种可能的起始条件，这些条件代表了杂交带起源的两种替代情景的明确实现：初级渐渗和次级接触。我们的结果表明，在某些情况下，杂交带起源的差异将导致可能持续数千代的显著不同的变异模式。我们的结论总体上与先前从偏微分方程得出的结论相似，但也存在一些重要差异。
