Figure 3.

Partitioning of deterministic and stochastic processes of bacterial community assembly and source tracker results

The first graphs (curves on the left) show the occurrence frequencies predicted by the neutral community model (NCM) at T1 sampling time. Results of sampling 18 months after grafting are provided in Figure S4. The taxa occurring more frequently than expected are shown as yellow dots whereas those occurring less frequently are in green. The solid blue line indicates the best fit of the model and the dashed lines indicate the 95% confidence intervals. The dashed lines indicate the neutrality envelope. Goodness of statistical fit R² and m (i.e., migration rate) are both indicated on the graphs. Percentages on the graphs indicate cumulative taxa occurrence frequencies Above, Neutral and Below fractions. The second graphs (bar charts on the right) show the results of the source tracker analysis indicating origin proportions of the above partitions of the NCM. The ‘unknown’ status within the source tracker analysis refers to these zOTUs that can’t be defined to belong to a given source. For the below partitions of the NCM representing a low proportion of the abundances (i.e., from 2.5% in panels D and E, to up to 6.1% only in panel C) made it statistically impossible to do the same source tracker analysis. The figure shows the results obtained for 101 grafted on Chenin (A) and reciprocally (B), Fercal grafted on Chenin (C) and reciprocally (D) and Bottlegourd grafted on Watermelon (E) and reciprocally (F).