African and Asian leopards are highly differentiated at the genomic level

It is now out in Current Biology Andrea's new paper characterising the level of genetic diversity and inferring the genetic history of African and Asian leopards.

Johanna L.A. Paijmans, Axel Barlow, Matthew S. Becker, James A. Cahill, Joerns Fickel, Daniel W.G. Förster, Katrin Gries, Stefanie Hartmann, Rasmus Worsøe Havmøller, Kirstin Henneberger, Christian Kern, Andrew C. Kitchener, Eline D. Lorenzen, Frieder Mayer, Stephen J. OBrien, Johanna von Seth, Mikkel-Holder S. Sinding, Göran Spong, Olga Uphyrkina, Bettina Wachter, Michael V. Westbury, Love Dalén, Jong Bhak, Andrea Manica, Michael Hofreiter (2021) African and Asian leopards are highly differentiated at the genomic level Current Biology 31(9):1872-1882.e5

Highlights

• African and Asian leopards are highly differentiated at the genomic level
• Out-of-Africa dispersal involved a relatively small number of individuals
• Leopards in Africa show higher heterozygosity and less structure than those in Asia
• Aligning genomic data with current subspecies boundaries can be challenging

Summary
Leopards are the only big cats still widely distributed across the continents of Africa and Asia. They occur in a wide range of habitats and are often found in close proximity to humans. But despite their ubiquity, leopard phylogeography and population history have not yet been studied with genomic tools. Here, we present population-genomic data from 26 modern and historical samples encompassing the vast geographical distribution of this species. We find that Asian leopards are broadly monophyletic with respect to African leopards across almost their entire nuclear genomes. This profound genetic pattern persists despite the animals’ high potential mobility, and despite evidence of transfer of African alleles into Middle Eastern and Central Asian leopard populations within the last 100,000 years. Our results further suggest that Asian leopards originated from a single out-of-Africa dispersal event 500–600 thousand years ago and are characterized by higher population structuring, stronger isolation by distance, and lower heterozygosity than African leopards. Taxonomic categories do not take into account the variability in depth of divergence among subspecies. The deep divergence between the African subspecies and Asian populations contrasts with the much shallower divergence among putative Asian subspecies. Reconciling genomic variation and taxonomy is likely to be a growing challenge in the genomics era.