Table 1. Estimates for colonization time (τ) and in vivo growth rate (r) for ancestral and early-evolved (passage 4) isolates.

Strain	τ (SE), minutes	r (SE), 1/minute	N
Ancestor	130.0 (27.9)	0.0240 (0.0063)	9
Evolved, line 1	61.1 (8.6)	0.0260 (0.0059)	9
Evolved, line 2	60.0 (14.4)	0.0280 (0.0060)	6
Evolved, line 3	44.0 (7.5)	0.0268 (0.0053)	5

N = number of time points combined for determination of mean and SE.

Abbreviation: SE, standard error.