Table 3. Longevity of four Drosophila species in response to dead Baker’s yeast.
| Female | Male | |||||
|---|---|---|---|---|---|---|
| mean | SEM | p-value | mean | SEM | p-value | |
| D. mel. | ||||||
| no yeast | 19.115 | 1.014 | - | 16.167 | 0.465 | - |
| dead yeast | 20.517 | 1.832 | 0.021 | 18.107 | 1.385 | 3.1x10-4 |
| minimal alive yeast | 28.444 | 2.921 | 2.2x10-4 | 15.5923 | 1.293 | 0.090 |
| D. gut. | ||||||
| no yeast | 12.4 | 1.029 | - | 10.567 | 0.948 | - |
| dead yeast | 15.733 | 1.638 | 0.041 | 13.733 | 1.334 | 0.031 |
| minimal alive yeast | 30.3 | 3.761 | 6.8x10-7 | 22.5 | 3.501 | 0.001 |
| D. def. | ||||||
| no yeast | 8.172 | 0.355 | - | 7.4 | 0.449 | - |
| dead yeast | 14.690 | 1.135 | 1.1x10-7 | 16.133 | 1.626 | 1.1x10-7 |
| minimal alive yeast | 16.867 | 1.378 | 7.7x10-9 | 18.067 | 2.297 | 2.4x10-7 |
| D. tri. | ||||||
| no yeast | 13.192 | 0.620 | - | 11.2 | 0.468 | - |
| dead yeast | 14.333 | 0.974 | 0.55 | 11.148 | 0.695 | 0.86 |
| minimal alive yeast | 32.483 | 4.360 | 1.3x10-6 | 28.548 | 3.972 | 1.6x10-7 |
Measures of female and male lifespan of D. mel., D. gut., D. def., and D. tri. treated with diets including no yeast, minimum dead yeast (1 scoop/fly/day), and minimum alive yeast (1 scoop/fly/day). All unequal variance t-tests were performed between no yeast and the other two treatments per species. p-Values were obtained by comparing test conditions to no yeast diets of that species and analyzed using pairwise comparison using Log-Rank.