Microsatellite analyses of the Antarctic endemic lichen Buellia frigida Darb. (Physciaceae) suggest limited dispersal and the presence of glacial refugia in the Ross Sea region

摘要: In order to assess the origins of Antarctic lichens (local or long distance), we examined population genetic structure endemic lichen Buellia frigida across a latitudinal gradient roughly 10° along Transantarctic Mountains, Western Antarctica, using four microsatellite loci. All loci were highly polymorphic. Data analysed as both biallelic (dikaryotic) and haploid in determine whether different life-cycle phases could influence our interpretation structure. For data, allelic richness (A) ranged from 5.25 7.99 measures diversity suggested low levels gene flow among most sites (e.g. F ST = G ST = 0.09–0.31; D EST = 0.03–0.7). 3.5 5.46, private (A r) 0.81 2.05, Nei’s unbiased distance 0.15 1.42 identity 0.24 0.86 locations. Two locations, McMurdo Dry Valleys Queen Maud stand out possible glacial refugia, with having high number alleles. Despite potential for wind-dispersed spores, it appears likely that successful colonisation areas is restricted. One explanation combination ice-free conditions water availability occurs only during short summer period when prevailing wind patterns may dispersal pathways. Dispersal southernmost site (Queen Mountains) particularly restricted be result barriers such glaciers. We conclude physical restrict spore settlement therefore recruitment regions.