Fig. 6

Sex ratio variation in individual clutches and fitness consequences in two-foundress figs of three levels of precision. Sex ratio variation for 10,000 pairs of each precision type for a a primary sex ratio of 3/14, b constant 20% per egg mortality, c constant 40% per egg mortality and (d) sex-specific per egg mortality of 30% for male eggs and 10% for female eggs. These are standard box and whisker plots with the heavy line indicating the median sex ratio. To calculate fitness each fig consisted of a focal female of the stated precision and a binomial non-focal female. The mean fitness of 10,000 focal females were calculated using equation (S1) for when n_h = 2. These were converted to relative values by dividing by the fitness of binomial focal female's which is the bottom of two values given above each box. The heterogeneity factor (hf) is also given above the relative fitness for each plot. Each estimate is based on 10,000 clutches that were 56 eggs in size before mortality and were generated in R. No male-less broods occurred