An Analysis of Factors Affecting Population Genetic Structure of Oligonychus ununguis Based on the Mitochondrial COI Gene Sequences SRAP Analysis on the Effect of Geographic Isolation on Population Genetic Structure of Populus davidiana in Tibetan-inhabited Regions in Southwest China Population differentiation and phylogeographic pattern of a relict species, Conandron ramondioides (Gesneriaceae), revealed from sequence polymorphism and haplotypes of the CYCLOIDEA gene Population genetic diversity of the insular plant Neolitsea sericea based on random amplified polymorphic DNA (RAPD)