Fig. 8
Relationship between propionate responses to arabinoxylan and proposed primary degraders, secondary fermenters, and metabolite utilizers. a Individual multiple linear regression models determine OTU responses (ΔW6–BL) that predict the fecal propionate response (ΔW6–BL). Y-axis shows the β-coefficient for each predictor, as in the average propionate response when OTU relative abundance increases 1%. X-axis shows the p value for each predictor. All models were adjusted by fiber dose/sex, where bubble size represents the adjusted-R2. b Proposed model of bacterial cross-feeding in the gut during degradation of complex, soluble arabinoxylans. OTU operational taxonomic unit