Diversity analyses of Central European Arabidopsis arenosa (white) and A. lyrata (grey). Diploids are hatched, tetraploids are blank. Bars give standard deviation, * gives significance. (a) Gene diversity, Ĥ; (b) Nucleotide diversity, π; and (c) Average number of nucleotide differences, k.
Jørgensen et al. BMC Evolutionary Biology 2011 11:346 doi:10.1186/1471-2148-11-346