The Effect of Genetic and Environmental Variation on Genital Size in Male Drosophila: Canalized but Developmentally Unstable
Figure 1
Genetic variation, allometric coefficient and fluctuating asymmetry of somatic and genital traits in male Drosophila melanogaster.
(A) Genital traits had low levels of total genetic variation (light gray bars, CVT) but not low levels of organ-autonomous genetic variation (dark gray bars, CVI). The difference between total genetic variation and organ-autonomous variance is an estimate of genetic variation that is correlated with variation in other traits (‘systemic’ genetic variation). Columns with the same letter are not significantly different for total genetic variation (CVT) using Tukey's HSD (P>0.05). Traits do not differ for organ-autonomous genetic variation (CVI) using Tukey's HSD (P>0.05 for all) (B) The low systemic genetic variance of the genital traits reflected their low multivariate allometric coefficient compared to most somatic traits, although these differences are not significant for multiple comparisons (Tukey's HSD, P>0.05 for all). Grey horizontal line is isometry. (C) Genital traits did not show low levels of fluctuating asymmetry. Light grey bars, line 303, white bars, line 324, dark grey bars, line 335. Within a line, columns with the same letter are not significantly different for FA using Tukey's HSD (P 0.05). All error bars are 95% confidence intervals.
