Research overview: the deep north-south split in lions

A consistent finding across lion genetics is a deep division between northern and southern populations that crosses the Sahara and reaches into Asia. This overview explains the evidence for this split from mitochondrial, nuclear, and ancient DNA, and how it differs from the older intuition that the major divide lay between African and Asian lions. It discusses the biogeographic causes, including Pleistocene refugia and barriers such as the central African rainforest and the Rift, that structured lion populations. The piece links the split to taxonomy, since it forms the basis of the two-subspecies arrangement, and to conservation, since the northern clade is far more endangered. It exemplifies how landscape history leaves a genetic imprint that classification must reflect.