Table 2: Ecotype-specific LS means ± S.E for body size (mm, back transformed values with upper and lower S.E. in brackets) and sqrt (male behaviour) for Misty Inlet (I), Outlet (O), and Lake (L) stickleback, with ecotype main effects and Tukey adjusted pairwise comparisons.

Trait Female size Male size Male aggression Male display (male ecotype) Male display (female ecotype) Ecotype Inlet 59.04 (0.54/0.54) 55.77 (0.86/0.85) Outlet 69.81 (0.57/0.56) 65.16 (0.93/0.92) Lake 68.48 (0.63/0.62) 65.20 (0.94/0.93) Ecotype main effect F 2,7.24 = 102.19 F 2,5.41 = 36.04 F 2, 36.7 = 7.54 F 2, 38.5 = 3.69 F 2,66.2=2.09 P <0.001 <0.001 0.002 0.034 0.059 Pairwise comparisons I vs. L *** ** ** * ° I vs. O *** ** ** ns ns L vs. O ns ns ns ns ns

P:° < 0.1, * < 0.05, ** < 0.01, *** < 0.001, ns > 0.1.