Summary of mutant life history responses in each bacterial environment.

Mutant life history traits: Fitness, Lifespan, Brood size, and Generation Time were determined in each bacterial environment (Table 1, Table S1) and significant (ANOVA, P<0.05) relative differences (up or down) from wild type were determined for each mutant in each environment. For each trait, total is the number of mutants (from 21 tested) that differed significantly from wild type in each bacterial environment; # up is the number of mutants that had values greater than wild type and # down is the number of mutants that had values less than wild type. Note: E = E. coli, M = M. luteus, P = Pseudomonas sp., B = B. megaterium.