Inbreeding and relatedness in the population
Global F is was significant (F is = 0.06, p_value < 0.001) showing inbreeding in the population. Pairwise relatedness was calculated for all possible male-female dyads and reconstructed couples. Mean relatedness among reconstructed couples (mean ± sd = 0.097 ± 0.21) was higher than the mean relatedness of all possible dyads (mean ± sd = -0.003 ± 0.15) (Figure 3). This difference was found to be significant when a t-test was performed on the mean (p = 0.008). The percentage of pairs with a relatedness greater than 0.25 and 0.5 was also higher for the reconstructed couples than for the potential pairs (r0.25: 17% vs 4%, r0.5: 3% vs 0.17%, Table 3). When looking at the effect of the relatedness of the parents on the fitness parameters in the clutches, a slightly positive correlation was found with the number of successful hatchlings, and no correlation with the clutch size and number of dead embryos was observed. (Supplementary Data 4).