Fig. 1

Heatmap displaying the most abundant and prevalent genera across all samples (n = 101) collected in three countries in Europe (DE, Germany; NL, the Netherlands; and ES, Spain). Fourteen core genera that occurred in the dataset after applying a 90% prevalence and 0.1% abundance threshold are displayed in bold font. The numbers in columns DE1 to NL1 represent the average relative abundance. ASVs, unique amplicon sequence variants per genus. Mean, overall average of the per-country averages