A combination of sexual and ecological divergence contributes to rearrangement spread during initial stages of speciation

Chromosomal rearrangements between sympatric species often contain multiple loci contributing to assortative mating, local adaptation, and hybrid sterility. When and how these associations arise during the process of speciation remains a subject of debate. Here, we address the relative roles of local adaptation and assortative mating on the dynamics of rearrangement evolution by studying how a rearrangement co-varies with sexual and ecological trait divergence within a species. Previously, a chromosomal rearrangement that suppresses recombination on the Z (sex) chromosome was identified in European corn borer moths (Ostrinia nubilalis). We further characterize this recombination suppressor and explore its association with variation in sex pheromone communication and seasonal ecological adaptation in pairs of populations that are divergent in one or both of these characteristics. Direct estimates of recombination suppression in pedigree mapping families indicated that more than 39% of th...同域物种间的染色体重排（chromosomal rearrangements）通常包含多个参与调控选型交配（assortative mating）、局域适应（local adaptation）以及杂交不育（hybrid sterility）的基因座。这类关联在物种形成过程中何时产生、如何形成，至今仍是学界争论的议题。本研究以某物种内性征与生态性状分化的种群为研究对象，通过解析重排与性征、生态性状分化的协同变异模式，探讨局域适应与选型交配在重排演化动力学中的相对作用。此前，研究人员在欧洲玉米螟（Ostrinia nubilalis）的Z染色体（性染色体）上发现了一处可抑制重组的染色体重排。我们进一步对该重组抑制区域开展特征解析，并针对在上述两类特征中至少一类存在分化的种群对，探究了该重排与性信息素通讯变异以及季节型生态适应的关联。对谱系作图家系的重组抑制程度进行直接估算的结果显示，超过39%的……