Extensive genome-wide phylogenetic discordance is due to incomplete lineage sorting and not ongoing introgression in a rapidly radiated bryophyte genus

The relative importance of introgression for diversification has long been a highly disputed topic in speciation research and remains an open question despite the great attention it has received over the past decade. We use whole nuclear, plastid and organellar genomes from 12 species in rapidly radiated, ecologically diverse, actively hybridizing genus of peatmoss (Sphagnum) to reconstruct the species phylogeny and quantify introgression using a suite of phylogenomic methods.

渐渗（introgression）对物种分化的相对重要性，长期以来一直是物种形成研究领域极具争议的核心议题，即便在过去十年间受到广泛关注，该问题至今仍未得到圆满解决。本研究选取快速辐射演化、生态多样性丰富且存在活跃杂交现象的泥炭藓属（Sphagnum）下12个物种的完整核基因组、质体基因组与细胞器基因组，采用一系列系统基因组学方法重建物种系统发育关系并量化渐渗程度。