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. 1998 Jan 20;95(2):617–620. doi: 10.1073/pnas.95.2.617

Table 2.

Estimated mean rates of self-fertilization in the hermaphroditic Utterbackia imbecillis and its dioecious congeners, U. peggyae and U. peninsularis

Species No. of populations Mean selfing rate No. of loci P <
H0: S = 0 H0: S = 1
U. imbecillis 7 0.70 10 0.008 0.02
U. peggyae 7 −0.06 18 0.23 0.008
U. peninsularis 6 −0.16 12 0.50 0.02

One-tailed P values were determined using Fisher’s sign test with one observation per population. H0, null hypothesis.