Figure 5

Functional impact of the inoculation sequences and density on the microbial community. Abundance of ammonia-oxidizers (AOB, AOA) and nitrate reducers (napA and narG) at weeks 0, 10 and 14 for the four inoculation sequences and Ni control, after low (light colour) and high (bright colour) inoculation density. Letters above indicate the significant differences between inoculation sequences (black letters) and a combined variable of inoculation sequence and density (grey letters) according to Tukey’s test (p < 0.005).