Population genetic structure and differentiation of Anthoxanthum alpinum in the subalpine-alpine ecocline of Swiss Alps
阿尔卑斯山高山-亚高山过渡区高山黄花茅的群体遗传结构和分化研究

Allozyme variation in 6 enzyme systems coding 10 loci was estimated for 18 subpopula- tions of Anthoxanthum alpinum from three altitudinal transects in two localities of the Swiss Alps. Mean proportions of polymorphic loci (95% criterion), average number of alleles per locus, and mean expected heterozygosity were 64.9%, 2.37 and 0. 252, respectively. Mean genetic distance among populations was 0.011, and 79% of the genetic variation resided within populations. Based on allozyme analysis, marginal subpopulations appeared to have similar level of genetic variability to central subpopulations. Relatively high genetic differentiation, low gene flow values and small neighbourhood sizes suggested that inbreeding followed by genetic drift was possible causes of lowgenetic variability in Arpette A. alpinum populations.