Fig. 3 | Nature Communications

Fig. 3

From: Sex peptide receptor-regulated polyandry modulates the balance of pre- and post-copulatory sexual selection in Drosophila

Fig. 3

Mechanisms by which polyandry modulates pre- and post-copulatory episodes. a Stacked frequency plot showing the simulated null distributions of sperm competition intensity correlation (SCIC) values generated from 1000 randomisations of empirical mating data for SPR− and control populations. Vertical lines highlight the observed SCIC value in our experiment. Dashed for SPR− treatment; solid for controls. Treatments differ in the range of SCIC values generated by randomisations, as a result of differing levels of polyandry between treatments. Observed values do not lie outside the range of values expected under the null hypothesis of random mating. b Average focal male’s repetitive mating with same female (mean ± SE). P value obtained from a F test of a GLM model. Horizontal black line represents the mean of the data. c Repetitive mating gradient on mean-standardised P. P value obtained from a Student's t -test of a Linear Regression Model. Sample sizes: N = 27 for controlSPR and N = 29 for SPR− treatment. Estimate—the estimate of the gradient. Error bars in c refers to the standard error of the mean (SE). White colour refers to controlSPR treatment; red refers to the SPR− treatment

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