Table S6. Domain-level (Archaea vs. Bacteria) composition per sample							
							
Sample	Group	Type	Archaea	Bacteria	Total_reads	pct_Archaea (%)	pct_Bacteria (%)
1st_BFP	1st	AMD precipitate-associated biofilm	4347	113256	117603	3.7	96.3
1st_BFW1	1st	wall-attached biofilm	368	99770	100138	0.37	99.63
1st_BFW2	1st	wall-attached biofilm	2076	109978	112054	1.85	98.15
2nd_BFP	2nd	AMD precipitate-associated biofilm	3668	84729	88397	4.15	95.85
2nd_BFW	2nd	wall-attached biofilm	51916	50617	102533	50.63	49.37
2nd_wt	2nd	water	31257	73076	104333	29.96	70.04
3rd_wt	3rd	water	12682	79175	91857	13.81	86.19