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(a) Sex-ratio decrease girls fecundity

Overall, SR/ST females produce fewer offspring than ST/ST females (F_dos,dos = 7.0, p = 0.0013), and this is significant for each SR strain (SR_Myself: t = ?2.9, p = 0.0049; SR_Ny: t = ?2.4, p = 0.018). However, there was not a significant difference in the effect of SR strain on female fecundity (SR_{Me personally}: 159 ± 8.3 (mean ± s.e.), SR_Nyc: 174 ± 11.5; F_{1,step 1} = 3.7, p = 0.056). Across both SR strains combined, SR/ST females produced an average of 165 ± 6.7 offspring (n = 74) whereas ST/ST females produced an average of 197 ± 6.1 offspring (n = 66), a 16.3% reduction in fecundity (95% CI 0.074–0.245).

Figure 1. Female fecundity of SR carriers is reduced when compared with wild-type females. Two different SR chromosomes were assayed (SR_{Me personally} and SR_Ny) in heterozygous females, and each was compared to wild-type (ST/ST) females with an otherwise similar genetic background. The dark line in the box indicates the median and the bottom and top of the box indicate the first and third quartiles, respectively. (Online version in colour.)

(b) Zero aftereffect of sex-ratio with the toughness

We find segregating variation for longevity, but we do not find that SR carriers show reduced survival relative to ST carriers. Read More