Fig. 2
Microbial assemblage variation according to diet, crewmembers, and time. a) Non-metric multidimensional scaling based on different beta-diversity indexes (reported on the top of each panel). Samples were colored according to crewmembers whereas the point shape represents the type of diet (FV, first variant; TV, third variant; NR, normal diet). The dispersion of groups was tested for homogeneity and results were reported on the top of each ordination (a p- value higher than 0.05 means that dispersions are homogeneous). b) Permutational multivariate analysis of variance using distance matrices based on the same indexes reported in panel a. The R2 values associated with each factor used in the analysis is reported in the horizontal axis whereas asterisks report the significance level of each factor (*, p-value < 0.05; **, p-value < 0.01). Colors represent the different factors modeled in the analysis. For additional information about diets, sampling point and crewmembers see Supplementary information and Supplementary Figure S1