Seasonal variation in the relative proportions of abundant taxa in the raw tanker milk microbiota. Taxa present in at least 1% median relative abundance after rarefaction at 15,000 sequences per sample are shown. Those that were positively correlated with a particular season by MaAslin analysis of rarefied data (coefficient, >0; q value, <0.05) and LefSe analysis of CSS-normalized data (LDA effect size, > 0; P value, <0.05) are marked with a white star.