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Ecological significance of microsatellite variation in western North American populations of Bromus tectorum Bromus tectorum (cheatgrass or downy brome) is an exotic annual weed that is abundant in western USA. We examined variation in six microsatellite loci for 17 populations representing a range of habitats in Utah, Idaho, Nevada and Colorado (USA) and then intensively sampled four representative populations, for a total sample size of approximately 1000 individuals. All loci were homozygous, indicating that the species is strongly selfing. Populations consisted of a few common genotypes and variable numbers of rare genotypes. Small sample sizes (n = 10 individuals) were adequate for distinguishing among populations, but larger sample sizes were needed to characterize more diverse populations, particularly in terms... Categories: Publication; Types: Citation, Journal Citation; Tags: Bromus tectorum, Plant Species Biology, adaptation, ecology, genecology, All tags... genetics, microsatellite, selection, simple sequence repeat, Fewer tags