Data from: On the evolution of migration in heterogeneous environments

Populations often experience variable conditions, both in time and space. Here we develop a novel theoretical framework to study the evolution of migration under the influence of spatially and temporally variable selection and genetic drift. First we examine when polymorphism is maintained at a locus under heterogeneous selection, as a function of the pattern of spatial heterogeneity and the migration rate. In a second step, we study how levels of migration evolve under the joint action of kin competition and local adaptation at a polymorphic locus. This analysis reveals the existence of evolutionary bistability where a low or a high migration rate may evolve depending on the initial conditions. Last, we relax several assumptions regarding selection heterogeneity commonly made in previous studies and explore the consequences of more complex spatial and temporal patterns of variability in selection on the evolution of migration. We found that small modifications in the pattern of environmental heterogeneity may have dramatic effects on the evolution

种群时常会遭遇时空异质性的环境条件。本研究构建了一套全新的理论框架，用以探究在时空异质性选择与遗传漂变（genetic drift）共同作用下的迁徙演化规律。首先，我们针对异质性选择下基因座（locus）的多态性（polymorphism）维持条件展开分析，将其作为空间异质性模式与迁徙速率的函数进行研究。第二步，我们探究在多态性基因座上，亲缘竞争与局域适应共同作用下迁徙水平的演化模式。本分析揭示了进化双稳性的存在：即迁徙速率的最终演化方向取决于初始种群条件。最后，我们放宽了以往研究中针对选择异质性的若干常规假设，并探究更为复杂的时空选择变异模式对迁徙演化的影响。我们发现，环境异质性模式的细微改动，可能会对演化过程产生极为显著的影响