FIGURE 2.

Nutrient use measurements, including mean niche width (A), mean growth efficiency (B), and niche overlap (C) of Streptomyces isolates from carbon-amended and non-amended soils after 72 h incubation period based on the utilization of 95 distinct carbon sources determined using Biolog SF-P2 plates. Mean niche width represent the number of substrates utilized. Mean growth efficiency was calculated by dividing total growth (sum of the absorbance values over all nutrients used) by niche width for each isolate. Mean niche overlap was determined for all possible pairwise Streptomyces isolate combinations from same treatment. Within each figure, different letters above the bars indicate significant differences among treatments. Bars sharing at least one letter are not significantly different from each other (ANOVA and LSD test, p < 0.05). Error bars represent standard errors.