The evolution of paleo- and neo-endemic species of Cactaceae in the isolated Valley of Tehuacán-Cuicatlán, Mexico

Research reveals that the Tehuacán-Cuicatlán Valley has served as a stable refuge for cactus species throughout Pleistocene climatic shifts. Most endemic Cactaceae emerged during this period, with a mix of paleo- and neo-endemics concentrated in topographically rugged and ecologically complex zones. The study used dated molecular phylogeny to classify endemism, finding that the valley's high climatic stability and diverse habitats likely fostered speciation, particularly of neo-endemics, while also preserving ancient paleo-endemic species. This highlights the valley's role as a biodiversity hotspot with distinct evolutionary patterns.

Soto-Trejo, F., Robles, F., Lira, R., Sánchez-González, L. A., Ortiz, E., & Dávila, P. (2024). The evolution of paleo- and neo-endemic species of Cactaceae in the isolated Valley of Tehuacán-Cuicatlán, Mexico. Plant Ecology and Evolution, 157(1), 42–54. https://doi.org/10.5091/plecevo.110352