Table 2.

Prokaryotic OTUs shared among the libraries. The sequences that compose the bacterial and archaeal OTUs were compared with Ribosomal Database Project II and Silva database respectively. The number of OTUs that compose each taxon are shown in parentheses.

Libraries	Bacteria shared	Archaea shared
SM20 CG20	Gp1 (3), Gp2 (4), Gammaproteobacteria (1), Deltaproteobacteria (1), Proteobacteria (3) and Bacteria (1).	Terrestrial Group (3) and MCG (4).
SM20 CG50	Gp3 (1), Gp2 (2), Gp1 (2) and Deltaproteobacteria (1).	Terrestrial Group (3), Rice_ClusterII (2) and MCG (5).
SM20 PA20	Deltaproteobacteria (1), Gp3 (1), Gp2 (2), Gp1 (2) and Bacteria (2).	Terrestrial Group (2), Methanomicrobiaceae (1), Rice_ClusterII (1) and MCG (6).
CG20 CG50	Ktedonobacter (1), Betaproteobacteria (1), Deltaproteobacteria (2), Gp13 (1), Gp1 (3), Gp2 (4) and Bacteria (1).	MCG (7), Thermoprotei (1) and Terrestrial Group (10).
CG20 PA20	Anaerolineales (1), Nitrospira (1), Gp3 (1), Gp2 (2), Gp1 (4), Subdivision3_genera_incertae_sedis (1), Betaproteobacteria (1), Deltaproteobacteria (2), Proteobacteria (2) and Bacteria (3).	Terrestrial Group (1), GOM_ArcI (1) and MCG (10).
PA20 CG50	Subdivision3_genera_incertae_sedis (1), Ktedonobacter (1), Desulfuromonadales (1), Deltaproteobacteria (1), Gp3 (1), Gp13 (1), Gp1 (3), Gp2 (5) and Bacteria (2).	Terrestrial Group (3), Rice_ClusterII (1), Thermopotei (1) and MCG (13).
SM20 CG20 CG50	Gp2 (2), Gp1 (1) and Deltaproteobacteria (1).	Terrestrial Group (3) and MCG (3).
SM20 CG20 PA20	Proteobacteria (1), Gp2 (1) and Gp1 (1)	Terrestrial Group (1) and MCG (4)
SM20 CG50 PA20	Gp2 (1) and Gp1 (1).	Terrestrial Group (1) Rice_ClusterII (1) and MCG (3).
CG20 CG50 PA20	Deltaproteobacteria (1), Gp2 (2) and Gp1 (2).	Terrestrial Group (1) and MCG (6).
SM20 CG20 CG50 PA20	Gp2 (1) and Gp1 (1).	MCG (3) and Terrestrial Group (1).