Table 2.

Phenotypic (P _ST) and neutral genetic (F _ST) differentiation in the three-spined stickleback (3s) and in the nine-spined stickleback (9s)

Species	Mean P ST (95 % CI)	Neutral F ST (95 % CI)	P ST/F ST	P ST > F ST
3s	0.19 (0.12–0.25)	0.078 (0.076–0.080)	2.38	7/14 (50 %)
9s	0.07 (0.04–0.09)	0.040 (0.039–0.041)	1.75	1/14 (7 %)

Mean P _ST represents the average P _ST of 14 morphological traits (Supplementary Table 2; excluding body size). Neutral F _ST was calculated based on 12,684 and 10,068 neutral SNPs in the 3s and 9s stickleback, respectively. The ratio of mean P _ST over neutral F _ST (P _ST/F _ST) and the proportion of single-trait P _ST values that significantly exceeded neutral F _ST (P _ST > F _ST) are also shown