TABLE 2 .

Mixed model results for bacteria^a

Disturbance	Estimated effect	P value
Intercept (AA)	0.0163	NAb
T1: D	−0.0450	0.3262
T1: S	0.0565	0.2159
T2: D	0.0659	0.1510
T2: S	0.0276	0.5472
T1: D × T2: D	−0.143	0.0282*
T1: S × T2: D	−0.228	<0.001***
T1: D × T2: S	0.022	0.7350
T1: S × T2: S	−0.176	0.0065**
Random effect
OTU	0.0459	NA

^aResults of the linear mixed model using disturbances at T1 and T2 as predictors of the OTU-level variability (as given by the residuals of OTU CVs) of bacterial communities from the nine experimental treatments. As in Table 1, disturbance effect estimates are given in comparison to the undisturbed treatment, AA. There were no significant effects of single disturbances on the variability of OTUs at T1 or T2. However, there were significant negative interactions between three doubly disturbed treatments, such that treatments DD, SD, and SS were less variable than would have been expected. No P value was calculated for the random effect, because we were not interested in testing how much variability was explained by differences between taxa. *, P < 0.05; **, P < 0.01; ***, P < 0.001.

^bNA, not applicable.