Table 3.

Results of the model of sneaking and sexual selection in sand gobies

% attempting to sneak of …		Mating success		Reproductive success		Opportunity for sexual selection
Non-nesting males, p0	Successful nesters, pnh	Mean	Variance	Mean	Variance
Proportion of males without a nest containing eggs (i.e., N0) = 0.425
0%	0%	1.95	3.61	13.58	229.22	0.94
0%	100%	2.49	5.86	13.61	225.02	0.95
100%	0%	2.47	2.46	13.65	170.03	0.40
100%	100%	2.49	4.13	13.61	199.52	0.67
Proportion of males without a nest containing eggs (i.e., N0) = 0.689
0%	0%	1.04	2.87	7.34	170.33	2.63
0%	100%	1.34	4.68	7.33	168.01	2.60
100%	0%	1.34	2.62	7.38	135.56	1.47
100%	100%	1.34	3.18	7.32	144.30	1.78

The top half of the table shows results when N₀ = 0.425; the bottom half shows results when N₀ = 0.689 (N₀ is the proportion of sexually mature males in the population that either have no nests or fail to attract females to their nests). The first two columns in the table show the parameters p₀ and p_nh, respectively. Other columns show the means and variances in mating success and reproductive success calculated from the simulations. The final column shows the opportunity for sexual selection, as given by the variance in mating success divided by the square of the mean (13). Reproductive success is measured here by egg area (cm²), which is highly correlated with the number of embryos in a nest.