Table 2.

Fitness of Populations over the Course of Recovery

Lineage	Flask	Fitness	SEa	Pb
ID12-ID2Fa	0	11.1	0.31	< 0.01
	10	16.5	0.21	< 0.01
	20	18.7	0.37	< 0.01
	40	20.8	0.20	0.09
	60	20.6	0.25	0.07
	70	21.9	0.35	0.53
ID12-ID2Fb	0	10.9	0.38	< 0.01
	10	18.3	0.35	< 0.01
	20	19.9	0.35	0.02
	40	20.9	0.30	0.11
	60	21.4	0.44	0.29
	80	21.3	0.11	0.21
	100	21.3	0.17	0.20
	115	22.5	0.31	0.78
ID2-ID12Fa	0	13.0	0.41	< 0.01
	10	13.6	0.45	< 0.01
	20	18.9	0.17	< 0.01
	40	20.2	0.32	0.03
	60	20.3	0.28	0.04
	80	20.3	0.22	0.04
ID2-ID12Fb	0	7.4	0.55	< 0.01
	10	20.2	0.32	0.03
	20	20.4	0.48	0.05
	40	22.8	0.37	0.87
	60	23.1	0.37	0.92
	75	23.3	0.30	0.94

SE, standard error.

^aBased on five replicates.

^bBased on a one-sided t-test with unequal variances comparing the population fitness to the fitness of the ID2 ancestor with mean fitness 21.9 and SE 0.68 based on five replicate measurements.