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Table 2 Sperm morphology traits in relation to fertilization success

From: Sperm quality but not relatedness predicts sperm competition success in threespine sticklebacks (Gasterosteus aculeatus)

Dependent variable
Competitive fertilization success
Explanatory variable χ 2 p-value
Tail length 4.909 0.027
Head to tail length ratio 4.398 0.036
  1. Both sperm tail length and head to tail length ratio significantly explain fertilization success in the in vitro sperm competition trials with fish from a freshwater and an anadromous stickleback population. Given are p-values and χ2. See text for details.