Barely Significant

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This absence of mean differences and differences in variability among habitats of origin does not reflect low overall variation in growth rate; in fact, there were highly significant differences among isolates within habitats of origin in their overall and media-specific growth (Isolate(Origin) [mean] and Isolate ∗ Media(Origin) [mean] effects, Table 2A ).
There is also a clear trend of greater separation of the community make-up of the treatments as treatment concentration increases throughout the treatment phases and when the columns are allowed to re-sour in phase 7 the treatments remain separate from each other and do not return to the pretreatment community ( Supplementary Figure S5 ).
Nevertheless, the full time-series data clearly showed a positive trend confirming the increasing incorporation of 15 N in these molecular ions. 15 N Atom Fraction Calculation The measured isotope ratios were converted to 15 N atom fraction (Atom%), which gives the percentage of a specific atom within the total number of atoms.