Inferences of demographic history and fine-scale landscape genetics in Cycas panzhihuaensis and implications for its conservation

摘要: Understanding the population genetic structure and demographic history helps in management restoration of endangered species. Cycas panzhihuaensis (Panzihihua sago palm) is narrowly distributed eastern Sichuan Basin China. The only extant Panzhihua Cycad Nature Reserve (PCNR), which close to City, threatened by mining industry slash-and-burn agriculture. To protect this rare species, local government implemented an ex situ conservation project. In study, amplified fragment length polymorphism (AFLP) was used explore diversity wild cultivated populations. Two evolutionarily significant units (ESUs) PCNR were determined based on differences histories. western ESU has low shares common genotypes with a part ESU. founder effect suggested as best-fit scenario explain current distribution among ESUs. Small carrying capacity limits both census effective sizes, gene surfing hypothesis explains high frequency fixed alleles without private multiple loci subpopulation. Every population, established for either or horticultural purposes, from single Supplementary collection preserve features C. panzhihuaensis.