Table 3.

Overview on the impact of filtering and decontamination on the number of retained ASVs and samples in this study. For details on each of the steps, please refer to the materials and methods section

Step	#ASVs	#samples
Unfiltered	4,309	152
Decontamination with “decontam” prevalence method	4,275	152
Remove phyla with only one representative	4,248	152
Removal of ASVs present in only one sample	1,016	152
Removal of samples with very low read count (<3,500)	1,016	126
Rarefy to even depth	983	126
Remove all taxa present in sequenced laboratory reagents and equipment	912	126