Research overview: the tiger subspecies debate, two versus six or more

Few felid controversies are as prominent as how many subspecies of tiger exist. This overview lays out the competing positions: a conservative two-subspecies scheme (mainland and Sunda) advanced on conservation-pragmatic grounds, versus a traditional six-living-subspecies arrangement supported by phylogeography and reinforced by genomic studies showing distinct, low-gene-flow populations. It explains the stakes: lumping eases managed gene flow and translocation, while splitting protects locally adapted populations and discourages mixing. The piece reviews the key evidence from morphology, mitochondrial markers, and whole genomes, and notes that the Cat Classification Task Force adopted the two-subspecies framework while genomic data argue for finer structure. It frames the disagreement as a values question about how distinctiveness should translate into names and management.