Figure 2.

Mean (± SE) log_e (number of spermatozoa on inner perivitelline layer) of successive eggs within the clutch for three groups of females (control females, experimental females that received extra-pair inseminations and experimental females that received no extra-pair inseminations). Asterisks between points indicate the results of Tukey post hoc tests comparing means for the two groups of experimental females (*, P < 0.05; **, P < 0.01; ***, P < 0.001); no other between group comparisons indicated a statistically significant difference.