Table 1.

Mean measure of bacterial local adaptation calculated as the proportion resistant to sympatric phage minus the proportion resistant to allopatric phage (S − A) across all pairwise comparisons within each time shift. Contemporary comparisons are shown in italic. CI, confidence interval.

bacterial time point	phage time point	mean S − A	95% CI	t27	p-value
July	June	−0.054	0.044	−2.373	0.025a
July	July	−0.019	0.036	−1.054	0.301
Sep	June	0.000	0.001	−0.665	0.512
Sep	July	0.002	0.003	1.201	0.240
Sep	Aug	0.006	0.015	0.782	0.441
Sep	Sep	−0.054	0.055	−1.930	0.064

^aSignificance at the 0.05 level.