Figure 4From: Sperm quality but not relatedness predicts sperm competition success in threespine sticklebacks (Gasterosteus aculeatus)Sperm morphology in relation to fertilization success. Shown are the differences in fertilization success and the differences in sperm head to tail length ratio (“brother” minus non-sib male). Data for the main and the control experiment were pooled N = 39. The line indicates the least-square linear regression line. For statistics see text.Back to article page