Fig. 5.

Co-occurrence networks of fungal and bacterial OTUs in (A) field barley grains, (B) steeped barley grains, and (C) kilned malts. Fungal and bacterial OTU nodes are shown in blue and pink, respectively. Correlations are depicted by the green (positive correlations) or purple (negative correlations) linkages. Nodes are proportionally sized depending on their degree. Top figures display the whole ecological network, while bottom figures show the associations between fermentation bacteria and potential plant pathogens. Barley and steeped barley networks are larger, more connected, and have a higher proportion of negative interactions than those of kilned malts. The malt community has a higher proportion of bacteria with fermentation capacities that are positively correlated. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)