Phylogeographic structure, demographic history, and morph composition in a colour polymorphic lizard

In polymorphic species, population divergence in morph composition and frequency has the potential to promote speciation. We assessed the relationship between geographic variation in male throat colour polymorphism and phylogeographic structure in the tawny dragon lizard, Ctenophorus decresii. We identified four genetically distinct lineages, corresponding to two polymorphic lineages in the Northern Flinders Ranges and Southern Flinders Ranges/Olary Ranges regions respectively, and a monomorphic lineage in the Mt Lofty Ranges/Kangaroo Island region. The degree of divergence between these three lineages was consistent with isolation to multiple refugia during Pleistocene glacial cycles, whereas a fourth, deeply divergent (at the interspecific level) and monomorphic lineage was restricted to western New South Wales. The same four morphs occurred in both polymorphic lineages, although populations exhibited considerable variation in the frequency of morphs. By contrast, male throat colorati...在多态性物种中，种群在形态组成与频率上的分化，具备推动物种形成的潜力。本研究以褐龙蜥（*Ctenophorus decresii*）为研究对象，评估了雄性喉部颜色多态性的地理变异与其系统地理结构之间的关联。我们共鉴定出4个遗传分化显著的支系：分别为分布于北弗林德斯岭、南弗林德斯岭/奥拉里岭区域的2个多态性支系，以及分布于洛夫蒂山岭/袋鼠岛区域的1个单态支系。上述3个支系间的分化程度，与更新世冰期时期种群隔离于多个避难所的演化历史相吻合；而第4个支系则为达到种间分化水平的高度分化单态支系，仅局限分布于新南威尔士州西部。两个多态性支系均存在相同的4种形态，尽管不同种群的形态频率存在显著差异。相较而言，雄性喉部的颜色...