Norms of reaction of wild-derived <i>Drosophila</i> populations.

<p>Lifespan and fecundity showed different shapes of response to yeast concentration. The effect of yeast concentration on lifespan best fitted a third-order polynomial equation (non-linear regression) and on fecundity a linear equation (linear regression). Goodness of fit is high in both models, as represented by R² values: For mean lifespans: 0.88, 0.74, 0.80, 0.88, 0.79 for <i>W^Dah</i>, <i>FRA</i>, <i>GRE</i>, <i>GER</i>, <i>NETH</i> strains respectively. For fecundity: 0.90, 0.87, 0.87, 0.89, 0.91 for <i>W^Dah</i>, <i>FRA</i>, <i>GRE</i>, <i>GER</i>, <i>NETH</i> strains respectively. For mean lifespans, best-fit values ranged for B0: 6.6 to 28, for B1: 86.5 to 176, for B2: -81.6 to -151, for B3: 20.9 to 36.8. Linear regression analysis for fecundity: for <i>W^Dah</i>: F = 484.2, DFn = 1, DFd = 48, <i>p</i><1×10⁻⁴, for <i>FRA</i>: F = 335.7, DFn = 1, DFd = 48, <i>p</i><1×10⁻⁴, for <i>GRE</i>: F = 309.9, DFn = 1, DFd = 48, <i>p</i><1×10⁻⁴, for <i>GER</i>: F = 373.6, DFn = 1, DFd = 48, <i>p</i><1×10⁻⁴, for <i>NETH</i>: F = 508.2, DFn = 1, DFd = 48, <i>p</i><1×10⁻⁴. Lifespan curves and fecundity slopes differed significantly among strains (for lifespan curves: F = 63.23, DFn = 16, DFd = 230, <i>p</i><1×10⁻⁴, for fecundity slopes: F = 27.10, DFn = 4, DFd = 240, <i>p</i><1×10⁻⁴).