Figure 4.

Interaction effect between glycolysis inhibition and addition of chemoattractants on the first principal component of the PCA, reflecting sperm velocity. Values are presented as means ± s.e.m. The main effect of the two fixed factors ‘treatment’ and ‘chemoattractants’ are indicated with a circle and square, respectively. Interaction effect is indicated with a star. *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001. Letters indicate differences following a post hoc pairwise comparison. DUI, doubly uniparental inheritance; SMI, strict maternal inheritance. Species: My. edulis (My. ed, n = 11); R. philippinarum (R. ph, n = 9); Me. mercenaria (Me. me, n = 9); N. obscurata (N. ob, n = 5); P. magellanicus (P. mg, n = 11). A detailed summary is reported in the electronic supplementary material, tables S2 and S7. (Online version in colour.)